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Hello, I just want to say a quick message. Welcome back. We are kicking off 2026 on the Ancients with a bang because we're talking about the rise of Christianity. And guys, we got so many episodes already lined up for you over the coming months. We're going to be covering everything from Alexander the Great to Neanderthals and early Popes. Ancient Egypt, Hadrian's Wall, Jericho, Korea, Arabia, India, Saber toothed tigers, Ice Age and so much more. That's all to come. We're so excited. We are prepped and primed to make 2026 the biggest ever for the ancients and we want you along with us for the ride for as long as you can. So exciting. Lots to get into and let's kick it off with with this episode today, the Rise of Christianity. It's the year 300 in the Roman Empire. Christianity is a small, fragmented religious minority and about to face the harshest persecution in its history. But fast forward a hundred years and the emperors are Christian, pagan temples are closing and bishops are political heavyweights. How did this happen? How did an empire that once hunted Christians come to embrace them. Today, we're tackling one of the most dramatic religious and political transformations in world history, the rise of Christianity in the Roman Empire. To help us unpack this extraordinary story, we're joined once again by historian Peter Heather, whose book Christendom explores how a tiny persecuted sect defeated its religious rivals, converted Constantine, and eventually came to dominate.
Peter Heather
The whole of Europe.
Interviewer
Peter, welcome back to the show. It is great to have you back on the podcast.
Peter Heather
It's fantastic to be here. And we're talking about something else.
Interviewer
We're talking about something else. I mean, who'd have thought it? We've done the fall of Rome, we've done the Saxons, and now we're doing the rise of Christianity, and I think it's fair to say the fourth century. It's a big century for Christianity.
Peter Heather
It's actually huge. There's quite a lot of scholarship out there that doesn't quite want to recognize it. But if you look at the before and the after, then a lot changes.
Interviewer
And can we say that this is one of the. The few big revolutionary moments in. In European and maybe even in world history, which is the rise and Romanization of Christianity across this century?
Peter Heather
In my view, you absolutely can. I mean, it's very hard to shake off hindsight here, because we know Christianity becomes this dominant cultural system across the European landscape, and then in the process of European expansion and colonization in the early modern and modern periods, it spreads across the globe. And you have this colossal structure. Absolutely colossal. The thought that it was anything ever other than colossal and that it might not have become so colossal. That is really hard to encompass when you first start thinking about it, I think. So, you know, stretching your mind back and really looking at the process that led to this outcome, that. That is worth doing, but hard to do, I guess.
Interviewer
It's also interesting as we'll delve into with. With certain key moments that epitomize this. I mean, what is it? It's the 1700th anniversary of the Council of Nicaea this year.
Peter Heather
Yes, it is. Yes.
Interviewer
So, like you also see over this century, almost the formulation of. How can we say, almost like official Christianity at the time, the kind of defining what is right and what is wrong in their eyes.
Peter Heather
Absolutely. So if you're thinking about Christianity, the system, then obviously when you're deciding what is the Christian view on anything, you go back to the Bible as the source texts, Old Testament, New Testament, but there is no religious system straightforwardly in the Bible. You have to extract the passages that you think are relevant to any particular topic, you know, understanding of God, what is good piety, you know, all the key questions and then you have to string them together in an order and iron out any ambiguities or potential contradictions occasionally. So turning the biblical evidence into the backbone of a system, that is a huge intellectual process and it takes a long time. Some of it doesn't happen really until the 12th century, but the 4th century is a big moment where some really key things are sorted out.
Interviewer
And do we have quite a rich array of source material for charting this rise of Christianity throughout the 4th century?
Peter Heather
For the 4th century we do have a lot of material. You've got a spread of Christianity through the highly literate classes, the Roman elites, and they write a lot about it. And with the removal of persecution, the Christian intellectual centers, you know, places like Rome, Alexandria, Antioch, their physical record of their writings doesn't get disturbed or broken up in the way that it did before. I mean they'd been literate since whenever, but the continuity in the transmission of texts is disturbed and broken up by persecution, Whereas from the 4th century onward it doesn't. So there's a certain amount of self centering where they burn the products of people who are deemed to be wrong as this process unfolds. But you know, if you look at the sheer quantity of writing that survives Christian about Christianity from the 4th century, I mean it's colossal. Would fill some very good bookshelves, probably this one.
Interviewer
Oh, easily. And quite a few.
Peter Heather
Easily, yeah, easily.
Interviewer
And as you as highlighted there, it's not very like lovey dovey, very peaceful. This, this rise of Christianity. There is some violent episodes in it as well which will certainly come cover. And I guess also on the archaeology side, I'd think of things like coinage straight away, but also architecture, the building of big churches and the like. I guess those are our other sources of information for this.
Peter Heather
Yes they are. And we, we do start to get them. There's only, I think there are about two, possibly three pre 4th century churches that have been identified and at least one of those is contentious, but they're basically just house churches as you, they're not purpose built buildings. So the one at Dura Ropos, which is the best preserved one, the Pompeii on the Euphrates. Yeah, absolutely. That is just a townhouse which has been converted for Christian use. So a central meeting room and a few side rooms, but it's just a house. It's like sort of modern Protestant sects that meet in houses.
Interviewer
Well, let's start exploring that. But first of all, let's go back right to the beginning of the 4th century. So 300 A.D. peter, what does Christianity look like at this time? Because often you'll get little snippets online saying that Christianity at this time was only like 5 or 10%. So what do we know about this?
Peter Heather
You don't have an exact figure, of course. Well, you know, it wouldn't be fun if you did. Would there be nothing to argue about? You have to kind of extrapolate. And there are some grandiose estimates suggesting that Christianity is between 10 and 20%, but there's no way that can be true.
Interviewer
And also when we say that, we mean within the bounds of the Roman Empire.
Peter Heather
Within the bounds of the Roman Empire, yes. There are a few Christian communities in the Persian Empire in Mesopotamia, not anywhere else. I don't think, don't think it's spreading across the Silk Road yet in any dramatic way. But that that figure's got to be wrong. The, the reason it's got to be wrong is that 90% of the Roman population are peasants living in the countryside. And we know that Christianity doesn't spread systematically into the countryside until the 6th century. It's actually a post Roman phenomenon. In the west, there are 12 areas of the countryside. Asia minority, Egypt, Syria, Palestine, where there clearly is some penetration of the countryside. But North Africa as well, many parts of the Roman Empire, no sign of any Christianity in the countryside whatsoever. So you can't get to 20%. That knocks that out. And then if you go more positively, a lot of French scholars, Roman Catholic, have put a lot of effort into identifying how many bishops there might be. Because the mark of an organized Christian community is whether it has a bishop or not in about 300 AD and there are 1800 or so city units in the Roman empire, and about 600 of these have an organized Christian community. So only one third.
Interviewer
Do you think that might even, that might even include London in the northwest?
Peter Heather
Three Brits make it to the Council of Nicaea in 325.
Interviewer
So that might suggest that, you know, 25 years earlier there probably still was a bishop of London.
Peter Heather
Thought, yeah, absolutely. It's, it's probably spread up through the, the sort of busier networks, economic and social networks that are an Empire. So third of the cities have an organized Christian community, but two thirds don't. City populations, 10 to 15%. We're down at more 5%, max. But that's obviously too much too, because although they've got Christian communities, the Total population of these cities is not Christian. They're living in and amongst other believers. So the oldest Christian continuous Christian community of all is Antioch because Jerusalem gets broken up in the revolt and the diaspora against the Roman rule in the start of the second century AD. So Antioch is actually the oldest continuous Christian community. And from the 380s where we have lots of information about Antioch, it looks as though Christians are about one third of the population of antiquity, only that the Jewish community and the classical pagan communities are both about the same actually everybody goes to everybody else's parties but at that point which the bishops don't like but you know, so if the oldest Christian community of all is only 1/3 of 5% as it were, then I don't see how you can get Christian numbers up above 1 to 2%.
Interviewer
No, because also if I think ancient Syria, you might think also I guess Mithras from further east, but then eligible and all those kind of Syrian deities as well into the Jewish community and the like. But is it very much the case that, let's say the Bishop of Rome, like the successors of St. Peter and their like small community in Rome, the exact like beliefs that they were following in Rome was probably different to what those that small Christian community in somewhere like London were following or Antioch or Hippo Regius in North Africa.
Peter Heather
We know that that is the case because this is one of the processes that does come fully into the light of day in the 4th century is that all these communities come into direct contact with one another and they find out that they don't quite believe the same things. The big issue of course, because it is the kind of unique thing about Christianity is this extraordinary doctrine about the deity. Three in one Trinity. Trinity and one person of it, one person in the Trinity, namely Christ being fully human and fully divine. You know, easy to say, but what does it mean exactly? What does that mean? You know, how are we to understand Christ, the figure of Christ and what is the implications of Christ's teaching for us given that he's like us but not like us?
Interviewer
And this will lead to names such as the, the Aryans and the Donatists and, and you know, you'll see that explode later as well, won't you?
Peter Heather
Yeah, no, absolutely. This is, this is the big dispute, the first big dispute that explodes in the 4th century is that you find that people are placing different emphases on the extent to which Christ's humanity is what's important or Christ's divinity is what's important. How to understand this and it goes back to the biblical evidence. Because the smartest description of this I've ever come across is actually the problem is created by the Gospels. You've got three Gospels, Matthew, Mark and Luke, which presents a very human Christ. And it's a Christ who suffers, it's a Christ who prays in the garden of Gethsemane, not my will, but thy will be done when praying to the Father. This does not sound like an equal divine personage, sounds hierarchical. But then you have the Gospel of John and it's fabulous. Opening in the beginning was the Word and the Word was with God and the Word was God. You know, complete cosmic equality. So the fundamental problem that Christians are facing is you have to explain John away in terms of Matthew, Mark and Luke, or you have to explain Matthew, Mark and Luke away in terms of John.
Interviewer
And we'll delve into all that. I mean, one last question from me. Of course you get all the, the so called apocryphal Gospels as well today. But at this time, let's say around 300 AD, can we presume that certain of these gospels, like the Infancy Gospel of Thomas or the Gospel of James and so on, that in some of these communities would not have been seen as apocryphal? You know, they would have learned those gospels as well. So we shouldn't also be thinking that they all, they had different beliefs, but they all were looking at the same gospels and then interpreting them differently. Some of them probably looked at different.
Peter Heather
Gospels to others certainly. I mean the main manuscripts we have of these alternative gospel texts are 4th century papyri.
Interviewer
There you go.
Peter Heather
So they're all still floating around.
Interviewer
So it's another spanner in the works there.
Peter Heather
Yeah, I mean they had, they had more or less decided or some people have decided the shape of the New Testament. So it's only the four Gospels and then Acts and the Epistles, not. So they weren't so sure about Revelation.
Interviewer
At that point of Revelation is fascinating, but that's a story for another time. Okay, so that's really nicely set the background of like the Christian world in 300 A.D. so maybe 1 or 2% largely in urban cities, Antioch and North Africa, Anatolia, bigger presences, but also small ones in London and Rome and so on. So let's start now. We've set that context with the last big persecution of Christians that happens around this time. And this is. It is known as the Great Persecution, isn't it?
Peter Heather
Yeah, it is. It unfolds in a series of decrees which eventually culminate in a kind of sacrifice or die order, it looks as though it kills. A few hundred people are executed in the course of it. The, the sort of more persuasive martyr acts. And you have some material that's entirely authoritative and every reason to believe it. Some that's a bit more fanciful.
Interviewer
But yeah, and this is Emperor Diocletian telling people that you need to do sacrifices to the gods to keep them happy. And so yes, the Christians say we can't do that and then a few of them who keep refusing do ultimately get, as you say, martyred in this persecution.
Peter Heather
Yes they do. Yes they do.
Interviewer
And how big an impact do you think this persecution actually has on Christians throughout the Roman Empire at that time?
Peter Heather
The best marker of its effect is that in the areas where Christianity had spread a bit more widely. So like Egypt or North Africa, the hot issue after it stops is what to do about lapsy people who had sacrificed or handed over the Gospels. You had to hand over the holy text, traditores as they were called, people who handed the material over. And there are very fierce disputes in the North African and the Egyptian churches in the three tens onwards about this. So that strongly suggests that it did generate a bitter divide amongst those who faced up to the full rigor of persecution and held to their faith without flinching and those who found various accommodations. The accommodation thing is interesting because that's the other striking thing about the so called great Persecution. It is a top down process. In the second century you've got people like Italian saying every time, you know, a volcano goes off or an earthquake, throw the Christians to their lives. Yeah, that's right. But no one's saying that in the 4th century and we know that town councils who had to enforce the collection of holy scripts and whatever would do deals with their local communities to hand over, you know, some account books, not the Gospels. So there isn't any sign of that kind of spontaneous suspicion and hatred of Christianity. I think in the first century people were confused by the body and blood stuff and thought weird stuff was going on in Christian rituals. But by the 4th century they're part of the urban fabric.
Interviewer
This was also what I was going to ask, I mean like would you think this so called great persecution was popular with the everyday Roman? But it sounds like what you're saying there by the 4th century, probably not because they've lived alongside Christians for so long even though they are a minority.
Peter Heather
Yes, absolutely. I mean the, the real issue about Great Persecution is why was it ever launched? Because you know, Diocletian successfully puts back the Roman Empire together, beats off the Persian threat, creates this system, and then 17 years later, having successfully done everything, turns to religious matters.
Interviewer
You're right. I mean, it is for an emperor who otherwise would rightly be heralded as one of like, I guess you could say greatest or one of the most significant Roman emperors. This is kind of, for many people, like the biggest stain on his reputation, the fact that he did decide to do it.
Peter Heather
Yeah. And it's also, you know, it's kind of bonkers, logically, if you think that you have to get the God's favor to be successful, then you would think you would do that at the beginning, you know, whereas actually he's successful and then he does it.
Interviewer
Is it fair to say that this great persecution is, is very much a failure and Christianity, as we get to the, the rise of the next big figure, Constantine, you know, it is as strong as it's ever been.
Peter Heather
Yes, I think, I do think that's right. And in fact, there are big queries over why it's launched. My best guess, for what it's worth, is that it's really about a power struggle within Diocletian's ruling circle and that people who don't like Constantine's father, who's a co emperor with Diocletian, think that he is soft on the Christianity angle. And they are trying to expose that and particularly cut Constantine out of succession. So I think it's a kind of struggle within the inner imperial circles. And it's very striking, for instance, that no martyrs are created in Constantine's father. Constantius runs Gaul and Britain. And there are no martyrs from the great persecution. Churches are shut down and whatever, but no one's killed.
Interviewer
No one's killed, indeed. And then of course, he becomes Constantine. His father, Constantius dies in York.
Peter Heather
Yes.
Interviewer
And Constantine is proclaimed emperor in 306 in York. Do you think there could have been a Christian community in York as well?
Peter Heather
That might easily have been one of.
Interviewer
The northernmost of them all.
Peter Heather
Yeah, well, because Christianity in the west is spreading through the bigger Roman communities, not in the countryside. So, you know, York is major imperial cattle capital, regional capital, and if you.
Interviewer
Get the worship of Mithras on Hadrian's Wall, then may well have been some Christianity there as well.
Peter Heather
There isn't a bishop at that point.
Interviewer
A bishop of Hadrian's Wall. Can you imagine that? Well, okay, let's get on to one of like these big traditional landmarks in the story of the rise of Christianity, which the conversion of Constantine and Also got in here, the Edict of Milan. Now, I will say that if you want to learn more in detail about the life of Constantine, we have done separate episodes, really delving into that. So we're going to kind of approach it through the lens of Christianity here, Peter, and not kind of do the whole biography of Constantine.
Peter Heather
Okay. I promise not to talk about the whole biography. Yes.
Interviewer
Where was he born? No. So do we have any idea with his background and with his family, with what might have inspired his conversion to Christianity?
Peter Heather
Well, yes, it's interesting, really interesting, because he says different things to different people about his conversion. We have two accounts of it. You know, you've got this. The classic image is cross in the sky just before the Milvian Bridge.
Interviewer
Dream big battle, 312 AD.
Peter Heather
But those are constructed in different ways in two contemporary sources. Lactantius in the 310s and then Eusebius of Caesarea. In the biography, he writes of Constantine after Constantine's death. So there's something a bit dodgy about that. And what's even more striking is that Constantine's religious position, his official one, as proclaimed by his spokesman and on its coinage, has four stages. So straightforward tetrarchic paganism, loyal to Diocletian, Same thing to start with. Then he becomes a solar monotheist. So Helios, Sun God or Sol Invictus.
Interviewer
This idea.
Peter Heather
Yes, Sol Invictus. Then he becomes Christian when talking to Christians, but otherwise vague monotheism with a lot, still a lot of sun. Then Christian to everyone. So there are four distinct stages. Each of those stages are marked by political victory, military victory. That's what separates them. So he moves to solemn monotheism when he defeats Diocletian's old buddy Maximian, he moves to the Christian to Christians, though vague monotheism to everybody else. After the Milvian Bridge, when he defeats Maximian's son, Maxentius, and then he's Christian to everyone after he defeats Licinius in 324.
Interviewer
324. So that's 12 years after the Battle of the Milvian Bridge. So these aren't abrupt kind of quick stages from one to another. They're big.
Peter Heather
And so at least part of the story of Constantine is coming out as Christian. Now, where in this progression do you date his actual conversion? You know, he's not completely open about this.
Interviewer
He's promoting himself at the same time to both audiences.
Peter Heather
Yes, he is.
Interviewer
It's very interesting. I remember, I've said in the past, remember to David Potter, so many years ago now, but I always remember this. This. One of the things kind of mentioned in our chat is this idea that, you know, for quite a bit of time, let's say between 312 and 324, it's almost like he is hedging his divine bets.
Peter Heather
Oh, he absolutely is hedging his bets. Yeah.
Interviewer
And you see it in the coinage, you see it in everything to kind of please both sides.
Peter Heather
Absolutely. I mean, my own hunch is that he was always Christian.
Interviewer
Interesting.
Peter Heather
And there's always a story of coming out, at least a sort of near Platonic, vague, monotheistic line from his father. His mother makes his famous visit to the Holy Land.
Interviewer
His mother, yes.
Peter Heather
Got a sister called Anastasia, which means resurrection.
Interviewer
So you think. So how big an influence do you think his mother might have had on it all? Do you think she was maybe inviting a Christian bishop in, in his early years when he was growing up?
Peter Heather
I think it's at least possible. And the thing is, he has to have a conversion, because if he hasn't had a conversion, he is one of the lapsy. He has hidden his Christianity in the great persecution, so he has to cover his rear end by having had a conversion after the great persecution. I may be being overly devious, I do realize that.
Interviewer
No, but it's very interesting to hear this idea that actually perhaps, you know, which is so, you know, completely new compared to other Roman emperors before him, that actually maybe he was influenced by Christianity from his earliest years, you know.
Peter Heather
And again, it ties into the expression of why the great persecution was launched. His father Constantius is one of four emperors. They're thinking about succession. Diocletian said he's going to retire. Everyone's concerned with who the next emperor is going to be and, you know, the knives are out. So trying to cut Constantius's line out of contention for the succession strikes me as by far the most plausible reason as to why the Great Persecution was launched.
Interviewer
Wow, that is fascinating. I had to delve into that more in another chat.
Peter Heather
I may have. May have spent too much of my youth Kremlin watching. Well, moving on. Yes. Putting that to one side.
Interviewer
So if we go to that, that fourth stage that you mentioned earlier. So after 324, when he defeats Licinius, and from that time it's gone from a rule of four to post Milvian bridge, a rule of two, Constantine and Licinius, to now a restoring of a rule of one. Yes, just Constantine. He's founded Constantinople by this time. Has he?
Peter Heather
Starting.
Interviewer
He's starting. And so how do we now see this fully, openly promoting of Christianity, Constantine coming to the fore after 324?
Peter Heather
The. The element to feed in is Roman imperial ideology, which says that God chooses emperors.
Interviewer
Right.
Peter Heather
And you can tell God is on your side by whether you win, because, you know, if the supreme omnipotent creator of the entire cosmos is on your side, you ought to bloody well win. You know, it's quite straightforward. And Constantine has won. He has won in spades. In fact, there were six emperors, actually, might be seven. Sorry, Brain. Going in 306. I think there are seven contenders in 306 of which he's won. And he is the last man standing out of all of this. And he's won all these victories. God is certainly on his side, and this is what gives him the ideological clout to stand up and say, you know, I'm Christian. Christianity is the right religion.
Interviewer
And if someone was to go to his royal court, let's say in, let's say, 325, would they expect. Or would they see Christian imagery, like, surrounding him in his court already by.
Peter Heather
That they would see some. Absolutely. We're starting to get crosses on some of his. Well, we've had the librarium in a few contexts after 312, but only a very few.
Interviewer
So what do we mean?
Peter Heather
The brarum is the cross with the semicircle at the top.
Interviewer
Oh, like the chi rho.
Peter Heather
Yeah, okay. The Cairo symbol. So we've had. But only in a very few. Now it's on his coinage still Sol invictus as well, depending on which coin. I mean, he's playing it up to every audience. But, yes, you're seeing librarum, you're seeing bishops invited to court. He doesn't stop patronizing pagans. It's not a kind of universal switch because he couldn't, you know, there are too many pagans in the world. But certainly Christianity has its place at court now and is allowed in.
Interviewer
And you get the rise of bishops, like, I guess, Sylvester, is it Pope Sylvester I in Rome at that time?
Peter Heather
Yes. Although whether Constantine ever met Sylvester.
Interviewer
Really interesting.
Peter Heather
It's medieval popes who put out the idea that Sylvester cures Constantine of leprosy and baptism. Oh, wow. Okay.
Interviewer
That's quite. That's quite strange.
Peter Heather
There's a bit of skin in that.
Interviewer
Game, but it seems very much so that. So we won't go into the Council of Nicer too much at the moment because we've done episode in the past in it. But by 325 at that time, you know, when that council is called and they're getting together to kind of decide up the Trinity and all of that, the fact that Constantine is there and seen as the figurehead there, you know, I know he's not there the whole time, but he's there for a bit of the time. Very clearly by that point he is openly showing himself as Christian.
Peter Heather
Yes, absolutely. As soon as he defeats Licinius, he writes a letter to the provincials which Eusebius has a text of and puts in his Life of Constantine. And there he's totally straightforward, says I'm Christian. Any anti Christian measures are being removed. But if you want to carry on being ridiculously superstitious and pagan, you can.
Interviewer
Right?
Peter Heather
I mean it's, the language is very straightforward.
Interviewer
It's almost like a toleration the other way.
Peter Heather
Yes, it is a toleration the other way.
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Peter Heather
And.
Interviewer
And actually going back to the toleration the other way. The other way before that. Because this is really interesting to put as a contrast to this. If we then talk about the Edict of Milan that had happened about a decade or so earlier.
Peter Heather
Yes, that's after the defeat of Maxentius at the Milbian Bridge.
Interviewer
So it's halfway through those phases of Constantine coming out kind of thing. So can you talk to us through what the Edict of Milan is and how important to stage this is in Constantine's development?
Peter Heather
Yes, it is the edict that officially ends the Great Persecution. In fact, it looks as though enforcement had petered out after about 306. But you have strongly pagan emperors in the east that Licinius defeats. It's a joint decree by Licinius and Constantine which is effectively removing the great persecution edicts and taking away their force.
Interviewer
As time goes on. And Constantine, he reigns into the 330s. How significant, how important then is this aligning of Christianity with the Roman state, with the Roman emperor in the rise of Christianity at that time and the more I guess the creation of a Christianity proper as it was?
Peter Heather
I think it's impossible to escape the conclusion that the slow coming together of Christianity and the Roman imperial system is a profoundly revolutionary moment in the history of Christianity. It sets in motion a series of processes that mean that Christianity as it emerges, say 100 years after Constantine, is completely different from what we understand it to be in about 300 AD. It isn't of course just Constantine. It's really the fact that Constantine inaugurates a succession of Christian emperors or which is only broken for two years by his. I don't know what he is. Weird second cousin twice removed.
Interviewer
We'll get to Judy in a bit.
Peter Heather
Yes, but Otherwise we have 100 years of Christian emperors where the, the tie in between Christian religious devotion and the Roman state is unbroken. And over the course of that hundred years, a series of processes play themselves out which totally transform Christianity.
Interviewer
And is this also this alignment, this centralization of Christianity in the Roman Empire started by Constantine, I guess also maybe benefited by him being a one man rule at the time? We mentioned earlier how a Christian community somewhere in London may well have been following different beliefs to Christian community in North Africa or in Rome. With the centralization and that link of Christianity and the more kind of unity of Christianity under Constantine and the Council of Nicaea, does that also result in a more uniform set of beliefs? So that actually by the 330s a Christian community in London would by and large be following the same beliefs as a Christian community in West Asia, for instance.
Peter Heather
Yes to the process, no to the chronology takes a bit longer. Okay. By the 430s, yes. In fact, Nicaea doesn't settle the argument. It's the start of the argument.
Interviewer
And this is the argument around the Trinity.
Peter Heather
It is exactly the relationship between God the Father and God the Son, really, whether it's a hierarchical relationship, you know, Father son can. I don't know why I say that. Having sons implies subordination of the Father to sons rather than anything else. But anyway, to most people, in most contexts, father son implies hierarchy.
Interviewer
Okay, respect my elders. In some contexts, Peter okay, we can understand.
Peter Heather
No, absolutely. But there's then, well, what is it? It's 56 years of back and forth and the official Roman Christian position for 35 of those is actually hierarchical trinity. It's only with the Council of Constantinople in the early 380s that Nicaea is reaffirmed. And then you get the crucial enforcement process which involves the power of the Roman state. Because what happens is under Theodosius, Council of Constantinople reaffirms Nicaea. But actually what everyone says in church as the Nicene Creed is actually the Creed of Constantinople. It's not the Creed of Nicaea. It's a slightly rewritten creed that came out of that second council. And then this massive enforcement whereby the churches of those who held to a more hierarchical trinity are confiscated churches, all their endowments, all their property and huge fines are put in place for important lay supporters of those positions. And it's that which shuts down the non Nicene Christianity.
Interviewer
I mean, how do you think Constantine fared when he's ruling? And he still sees that there are, you know, in these early stages, there are still bitter divisions amongst the Christians at this time, even though he's favoring them, you know, with the imagery and kind of that reverse toleration kind of decree where now they're tolerating non Christian religions. How do you think he feels, you know, still seeing that, you know, there is now kind of rivalry and I guess in animosity.
Peter Heather
It is animosity. And I'm sure he's got bloody bishops, but, you know, this we do not. The documentation from Nicaea is not very strong. The, the biggest account of it is in Eusebius of Caesarea, and he's a partisan attendee, so you never know quite how much to trust it. But the story that he tells is Constantine gets them all in a room. He suggests the definition of the relationship between the father and the son. Homuzios identity of substance. Eusebius says Constantine came up with that. And then he bangs heads together until they agree. That's the story as told by Eusebius. And only about three people wouldn't go along with it and they get exiled.
Interviewer
But Eusebius is almost trying to promote Constantine as the head of the Christian Church.
Peter Heather
Then, yes, he is.
Interviewer
Well, other than the Pope or something like that.
Peter Heather
Absolutely. But there is no pope in the 4th century. You know, there is a bishop of Rome who is one of, as it turns out to be, five patriarchs. What defines patriarchate is that it was a. See a community that was Established by one of the apostles. And they go with five. So Rome, Antioch, Alexandria, they add in Jerusalem because although it'd been broken up.
Interviewer
You know, kind of have to.
Peter Heather
Yeah. And then they on the most dodgy of grounds add Constantinople because it is the new Roman should have all the. This is something else that is done at the Council of Constantinople. Funnily enough, in the early 380s we have five patriarchs who are all of equal standing in the official view, except of course, the view from Rome. But no one's listening to that except in Rome. The emperor is the only person with universal authority over the entire geographical area of the empire. And the emperor has been directly appointed by God. No one challenges that. So it's extremely natural that the emperor should have religious authority. And in particular it is only emperors and this is never challenged in this period. Who can call these general ecumenical councils of everybody.
Interviewer
So Constantine is very big in the rise of Christianity and I'm guessing the elites follow suit. They see that Christianity is on the rise. So there's a spread of people following Christianity at that time. So by the time of his death, you know, is Christianity very much a rising force?
Peter Heather
Christianity is a rising force by time of Constantine's death. But again it's the fact that his successors are Christian that's so important. Important. It's the fact that for the best, well, forever after consign, apart from the Emperor Julian, that the imperial machine is headed by Christian emperors.
Interviewer
Well, let's talk then about his initial successes. So these are the sons of Constantine and are they all Christian?
Peter Heather
They're all Christian. Right. They, they take a different view on the relationship of the Father and the Son, but they are all Christian. And you start to see a change in the political culture at the center. The perception is out there that although pagans are still in receipt of imperial patronage, it is a slight advantage to be in line with the emperor's belief. And it is that perception over I think two to three generations. That means that by say the 380s, by the time of the Emperor Theodosius, that the functioning bureaucratic elites at the center of the empire are by and large at least nominally Christian.
Interviewer
So how do we then get in the middle of all of this, the rise of this, you know, the so called the last pagan emperor, Julian the apostate.
Peter Heather
I think you get it because you're right on a knife edge at that point. So Julian hides his paganism.
Interviewer
Oh yeah, Constantine may well have hidden his.
Peter Heather
Yes, it is Julian, Julian's behavior that makes me think about Constantine coming out. So we know the stages of Julian's coming out as pagan. We know he dated his own conversion to paganism to the early 350s and he only comes out as pagan when he's in open revolt against his cousin Constantine's son, Constantius ii. And he comes out in stages. So he comes out to some people first and then after Constantius dies on the way to fight him, sign from God we're pagan to all comers.
Interviewer
And is it, do you think, Julian very much playing to that audience was reflective of a wider. There was still resistance there to this new rise of Christianity. There was a still worship of the old gods by quite a lot of people.
Peter Heather
Oh absolutely. The rank and file of the population are still going to the old temples and doing the old things. But you get these occasional glimpses of the kind of behaviors that the Constantinian dynasties adoption of Christianity required of people. So Julian makes a famous visit to the city of Troy in the 350s before he's come out as Christian to see the temples to Hector and Achilles, you know, the great heroes, the Trojan War. Because Homer is a kind of religious text for one brand of classical Pagans in the 4th century and he's been told that the temples are in ruins, but he turns up and the local bishop greets him and takes him on a guided tour and he finds that the local bishop is actually protecting the temples. This man called Pegasios, who is probably my favorite person in the entirety of the fourth century. Pegasios, yes. Completely unknown otherwise. But what's so great about Pegasios and why we know this story is that later when Julian is fully in control of the empire and launching a new style pagan priesthood and Bishop Pagasios applies for a job in it.
Interviewer
He seems quite malleable in what he believes.
Peter Heather
Well, yeah, I mean the sixty four thousand dollar question is what the hell did Pegasus believe? Is he really a pagan? Does he not really care that much? I mean it could be either of those. But you know, that's just one anecdote that we have. We've had to find bishops for 1200 Roman cities just like that. You know, after Nicaea, this is. He clearly got the job. I imagine he's a local landowner.
Interviewer
Oh yes, I'm Christian. Yes, yes.
Peter Heather
That he will use whatever official office is there to run his local community, I'm guessing. You know, I think it must be something like that, whether it's Christian, Christian, pagan, whatever it is. But you know, this is, this is what we have to think about that, you know, conversion, we think of light bulb moments. Paul on the road to Damascus, Constantine, haha, seeing a cross in the sky or Augustine of Hippo hearing voices in the garden that tell him to go and read vital passage. And there are some conversion moments that are like that. But there's lots of conversion in the course of history to many religions which is much less profound. Not such a life changing moment. It's actually more decision, a calculation of advantage and odds and whatever. So I think you've got a lot of, you know, some people do this, they collect information about Roman officials and whether they're Christian or not. And you can see the numbers going up through the 350s, 360s, 370s, but, but the question is what kind of Christian are they? Are they like Pegasios? There's absolutely no reason to think that Pegasios is less representative than say Augustine of Hippo in terms of what his conversion might be. There is once that perception is there because the Roman state is a one party state that if you're ideologically in line with the Emperor, you might get preferential promotion. It works by connections. Then there you go.
Interviewer
Well, even with cases like Pagasios under the, under Emperor Julian, his roll backing of Christianity, it doesn't seem to be very successful or very effective. I mean Christianity, it holds out, I guess it, it endures past Julian. Why is it so effective in resisting this attempt by Julian to roll it up?
Peter Heather
Because it only lasts for two years.
Interviewer
Only two years, that's only much he's ruining.
Peter Heather
It's not long. And actually Julian fails the ultimate test. What Julian does is invade Persia. Why does he invade Persia? He wants a victory, same thing that Constantine had. Victory is the sign of divine favor.
Interviewer
And he gets a defeat, he gets a thorough defeat. That's a big. Okay, that's a good propaganda win for Christianity.
Peter Heather
It doesn't look like God's on the side of Julian. No. So we don't get a sequence of pagan emperors. I mean these counterfactuals are always very difficult to answer. But you know, had Julian got his army back safely, having sacked the Persian capital Tisiphon, which he, you know, he wasn't too far from doing that, then he would have had enough to proclaim a victory and he might well therefore have been able to set in place a pagan succession. But he didn't have any children of his own. Would have been more complicated than Constantine. But you know, sequence of pagan emperors, you could see a reverse of that process. If we think that a lot of the people who are declaring themselves Christian are a bit pegasios, like they would be quite happy to declare themselves not Christian again.
Interviewer
And the emperors that follow Julian then, is it. I don't know if Jovian's before or after, but then are there a few more big ones that are out and out Christian?
Peter Heather
They're all Christian. I think Julian's propagand policy, but very divisive. You can't tell, you know, what the outcome would have been had he lasted 20 years and initiated pagan successors. So it's really difficult to judge whether he's realistic that the clock could be turned back or whether he's bonkers. It's very hard to judge that. And I couldn't give you a clear answer that I really believed in on that. I don't know what the answer is, but it's clear that it was very divisive and the conclusion was drawn in the sort of top bureaucratic and military circles where the choices of emperor are made that actually a Christian emperor, but a tolerant Christian emperor is the right move because the next two emperors, so Jovian, who follows Julian and the brothers Valentinian and Valens who follow Jovian, they both roll back to more Constantine's position on toleration than Constantius's position. Constantius had ramped up that pro Christian favor, but the successes, and that's really the mark of Julian's success, if you like, or the mark of how much division was still there in Roman elite circles that, that they dial it back.
Interviewer
So who do you think then are the people surrounding these emperors as time goes on, who actually then encourage them to not just stick to this toleration, to actually then kind of go back to more Constantine, more out and out Christian, more pushing forward, I guess, even more radical policies for the time that goes away from toleration and more towards. You've got to accept Christianity now.
Peter Heather
Yeah. As I understand the process, there are two things going on. The Roman elite is coming to some kind of accommodation with Christianity, generally speaking, the landowning elites who run the local communities still. So they may not be absolute, you know, born again Christians, but they're going to church, they are declaring in public that they're Christian. That is happening. But then because you've got Christianity as the official religion of the empire, you've then got pressure groups, particularly leading bishops and Christian intellectuals who are pushing a stronger Christian agenda.
Interviewer
Is this a figure like Ambrose?
Peter Heather
It is a figure like Ambrose, but it can also be imperial officials who are very pro Christian. So when what we Start to see under Theodosius from the 380s is a first round of shutting down temples on a large scale. Constantine has shut down 7. They're about 20,000 I think at least. No one's ever counted.
Interviewer
Barely a scratch.
Peter Heather
Okay, barely a scratch. Yes. And Eusebius mentioned everyone he could think of and still only came up with seven. So they're all mentioned by individual names. So not a lot happened. Constantius made it possible to shut down a few more, but that was if people had. What Constantine did ban was blood sacrifice. You can throw olive oil around, you can throw wine around, you can light candles, you can pray, incense and all that. Yeah, yeah. But you can't do blood sacrifice. And Constantius made it possible to shut down places where people were still doing blood sacrifice. And clearly some again, I think not that many. There's nothing that says it was huge numbers. Some get shut down in the 340s and the 350s because of that. The big moment when they start to get shut down start is the 380s under Theodosius. And at that point the first figure we hear about who's playing a leading role is an imperial official, one of Theodosius administrators in Syria and Palestine. He's in close alliance with bishops. Local bishops and monks play a role in the temple destruction as well. But it looks like there we've got a properly born again Christian official in alliance with Christian pressure groups exploiting the fact that most of the Roman elite is not going to fight you if you shut down a temple.
Interviewer
And this is the more violent side coming out, isn't it? This is not just shutting it down and barring the gates, this is torches and rousing almost like the demagogues in Athens. This is rousing the rabble to follow and burn down these sites.
Peter Heather
Yes, that's right. Again, there are fights as to how many do get shut down. We have a pagan letter writer and commentator from Antioch, Le Manius in the 380s who's one of the chief sources about this. And he's obviously saying he's shutting down millions and burning them down. You know, it's not clear exactly how many, but, but that is, that is the process. So we need the local Roman elites who run communities not to care too much. And then we need officials who, a few officials who do care in alliance with the, the Christian pressure groups.
Interviewer
Right. And so this first kind of big edict he mentioned under Empress Emperor Theodosius I, he's also known as Theodosius the Great, isn't he like Constantine the Great, I guess, aligning with Christianity ideas. Is this the Edict of Thessalonica, the first one that kicks in?
Peter Heather
No, that comes a bit later. That's in the 390s.
Interviewer
Right, my apologies.
Peter Heather
Yeah, no, no, the, the first stuff we've got going on is in the 380s. And it looks as though what happened is that this local official man called Materna Sineadius extended the scope of existing legislation which was shutting down the Aryan churches to paganism. So there isn't an edict which says temples are to close.
Interviewer
Right.
Peter Heather
It's an interpretation of existing legislation and a widening application and only in one area. So only Syria, Palestine, the Diocese of Orians, which Materna Sinages was in charge of. Then that kind of momentum starts to grow and you do get this edict in Thessalonica from the early 390s, which then starts to have more general application. And we see the same kind of process we've seen in Syria, Palestine in the 380s, going more broadly across the Roman world in the 390s.
Interviewer
And so this is when. Yes, this becomes more an imperial wide order to shut down pagan centers and the like. Yes, if you want to, if you want to.
Peter Heather
That. That's why the kind of attitude of the local Roman elites in every community is, is important to the process at this stage. If they're resistant, if they don't want to do it, then they will petition the imperial center and they get exemptions or exceptions. So there's one that says, I can't remember which city it applies to, but it says, you know, there's obviously really ancient beautiful buildings so we need to leave these alone.
Interviewer
Well, I mean you say that, but I would immediately go to someone like Alexandria where with the 390s, you associate it with at least I do with probably the destruction of Alexander the Great's tomb because it's also a site of where people go, a place of pilgrimage, kind of a deified figure. But of course the most famous one is the Serapeum. Isn't it a beautiful temple in Alexandria? And they completely burn it to the ground. So there are also even in cities like prestigious ancient cities which have beautiful like monuments from before the 4th century. I mean that's say like, you know, those exemptions aren't, you know, they aren't always the case.
Peter Heather
No. Oh absolutely not. And, and I think what I would suspect and what the evidence suggests is that the precise outcome varied in each locality according to the attitudes of the governing classes in that region. So Carthage, for instance, the temples are shut but not pulled down. So you get a wide variety of outcomes, but the general trajectory is closing it down.
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Interviewer
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Peter Heather
Car selling made easy on Carvana. Pick up fees, Nanti.
Interviewer
And so what happens next? Is there still more edicts that will go along that will then decide more about the, the futures of these now closed down pagan temples?
Peter Heather
Well, we're talking about pagan temples in towns, in cities. They're still the countryside.
Interviewer
Right.
Peter Heather
And the next thing in the legislative sequence, well, two things going on in the 390s already they're saying you can't be a pagan and be in imperial service. So we go from preferring Christians in the imperial service to saying you can't be a pagan and imperial service. And that's so a crunch moment in the 390s. That's one legislative strand. The second one is trying to shut down paganism in the countryside. The first rules relate to temples that happen to be on land owned by the emperor. So imperial estates of one kind or another. And then in the late 420s, more general prohibition against temples in the countryside. What enforcement looked like, no idea. But.
Interviewer
But these are now all imperial orders.
Peter Heather
Yes, they are.
Interviewer
So once again, it's very much like the church is just, it's a, it's a wing of the imperial, of imperial authority.
Peter Heather
By this time it absolutely is. The, the, the church has become a, a branch of the empire. And I think what's different about it is that the empire had always dictated the cultural preferences of elites. So in the sort of 1st century BC and AD when the empire is established, you see this wave of cultural Accommodation amongst landowning elites in the conquered provinces. They all come into line with the imperial culture. They all learn Greek or Latin, they start wearing togas. They connect themselves into the imperial system. They get the right to find their own Roman local towns. They do all of these things because they have to, to succeed within the empire. You know, it's a bit like being a party member in one of the old Soviet states. You, if you want, and if you want a succeed in what is very firmly a Roman Empire, you have to be a Roman. And this affects elites. So we've seen that before amongst the elites. What's different about Christianity is because everyone has a soul. It's actually once the empire is Christian, then it's also interfering in the lives of everybody. And we're actually dictating cultural preferences and religious behaviors or trying to for everybody. And that's very new.
Interviewer
So this is the time, I mean, yes, because you might think of like in the past when people might talk about the coming of Greek culture to the ancient Near Eastern, likes after Alexander the Great. There's very much this idea, yes, you can see it in the towns and the cities. You can see it with the elites because they can get benefits by Greek culture. But everyday people like Egypt, you know, they kept doing their traditional beliefs. This is like a step change that by the end of the the 4th century it's kind of gone past that. With Christianity in the Roman Empire, it is now very much the rural, the 90 of the population or whatever, the people outside the cities that even their lives are now clearly being affected.
Peter Heather
Yeah, Christianity, they're starting to change again. You have to emphasize the time frame. It really is the 6th century in both the post Roman west and the still Roman east before people are taking systematic initiatives to provide a Christianity that can reach the mass of the rural population. So it takes a long time. Christianizing the entire world is not a quick task.
Interviewer
Yeah, 16 could have just done it.
Peter Heather
No, absolutely not.
Interviewer
But one of the other takeaways from this chap, which I absolutely find fascinating, is very much. It is, you know, those Roman emperors of the 4th century to kick it off. Many of them, they ultimately decide what is orthodox Christianity, you know, what to follow.
Peter Heather
Well, they do. Or they rubber stamp it. They rubber stamp it, in a sense, the concilia process. So calling these ecumenical councils, gatherings of representatives of every Christian on the planet. And this is what defines an ecumenical council. Nicaea is the first one. There are others which aren't recognized now as ecumenical councils because they came to the wrong decision, but they are exactly the same, same thing. They're the ones that Constantius held which decided that actually the son was inferior to the father. Yeah, the. The sort of Aryan position, as it's called. They were similar gatherings. But yes, the process is. Emperor calls people together, Emperor presides over the discussions in some way and Emperor enforces. And when this process gathers its momentum, as it has done by the 5th century, then you only ever call a council when an emperor knows what answer they want. Bishops are involved in helping him make up his mind. But you don't call a council that's going to fail because that's a public relations disaster. I mean, it's a bit like a big climate summit or something like that. If it doesn't come up with an answer or a big statement, then it's a failure. So you see emperors being lobbied, preparing opinion. Then when enough of the ducks are in a row, we call the council Emperor. Emperor's officials preside. We start to get full minutes from the 5th century of these. So you can really. Minutes, yes, you can really see what's happening at these councils and imperial officials preside over the sessions. They know what answer they want before they go in. That answer is duly arrived at and then the panoply of imperial legal force is deployed to enforce the decision.
Interviewer
Bit of a. A show trial equivalent, then, or, you know.
Peter Heather
Well, it is, yeah, it is, but yes, absolutely. In that sense, although you've got all the lobbying by all the Christian intellectuals and bishops and whatever, the buck stops with the emperor and the emperors are responsible for these decisions.
Interviewer
Peter, it's been so fascinating, like in the course of this chat, to go from the beginning of the 4th century to the end and how you have gone from the Christians being such a small minority to, you know, thanks to Constantine primarily, you know, starting it and, you know, showing support to the Christians and then this idea, this switch you see as time goes on of then tolerating the non Christians and then that next big step later on, which is then saying, actually you can't worship anymore and the like. And from toleration to you must worship Christianity. It's fascinating to think that actually all happens within, you know, it all kick starts. Yeah, within a century or so.
Peter Heather
Yes, it's truly extraordinary. I mean, if you think about classical Greco Roman paganism, it's changed over time, but a lot of this has roots in a organic process of evolution that takes you back to the Bronze Age transition. You know, it's that old, you know, you're looking at Temples that have been there for thousands of years. And certainly the Egyptian temples which eventually shut down in the 5th century, they've been there since God knows when, you know.
Interviewer
Well, Temple of Isis right at the south, that last kind of bastion and where you see the images of Egyptian deities just kind of rubbed out right at the end. But actually to finish it off still, some of those temples do get converted into churches. They do endure. They have that Christian afterlife.
Peter Heather
Yeah, they do. And often the Egyptian evidence suggests that you did some kind of Christianization because the pre Constantinian Christians thought that the gods were in fact devils, that this is Satan's fallen angels who are occupying these temples. So you need to cleanse them, you need to exercise them. So inserting a Christian presence into the physical landscape was a way of getting rid of the demons. Wow.
Interviewer
There you go, Peter. I could ask so many more questions, but I think we've covered them all. I've got one last statement that I'll just read out here, which is like the Romanization of Christianity, I. E. The co. The co. Optation of Christianity into the apparatus of the Roman state is the crucial factor in its rise to prominence in the 4th century. Would you agree? Crucial fact.
Peter Heather
I think I wrote it.
Interviewer
Well, there you go. Well, I know where they're coming from.
Peter Heather
But I think this is it. You know, when you get these great religious changes, it's really hard to envisage that it could have been any other way. But you have to think about what a colossal process it was to shut down Greco Roman paganism. And you need. It's like Henry VIII shutting down the monasteries. Yes. Before that happens, the monasteries have been there with a continuous history in England for, well, since the 10th century, so 600 years. And they're a fact of life. They're huge, they're rich, they're everything. And then they're gone. Yeah.
Interviewer
Step change. Complete step change.
Peter Heather
Yeah.
Interviewer
Peter, this has been absolutely fascinating, as you can probably guess. We have read your book in preparation for this. Your book on this topic is called.
Peter Heather
Called Christendom. Christendom, Just the triumph of a religion, I think. But I. I didn't write that bit. I liked Christendom.
Interviewer
Well, as always, it just goes to me to say thank you so much for taking the time to come back on the podcast.
Peter Heather
It's been a pleasure. Thank you for.
Host
Well, there you go. There was the fabulous Dr. Peter Heather, kicking off our Ancients 2026 schedule by talking through the rise of Christianity in the 4th century A.D. i hope you enjoyed the episode just as much as I did recording it, exploring figures like Constantine the Great, Julian the Apostate, and Theodosius.
Interviewer
Thank you so much for listening.
Host
This is just the beginning. We're back and we're ready to share amazing stories with you throughout 2026 from the ancient and prehistoric worlds to make sure you don't miss an episode. Well, please follow the Ancients on Spotify or wherever you get your podcasts. That really helps us and you'll be.
Interviewer
Doing us a big favor if you'd.
Host
Be kind enough to leave us a rating as well. While we'd really appreciate the that now, don't forget, you can also sign up to History Hit for hundreds of hours of original documentaries with the new release every week. Sign up@historyhit.com subscribe. That's all from me. Welcome back to the Ancients in 2026 and I'll see you in the next episode.
Interviewer
Foreign.
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Peter Heather
Yeah.
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Interviewer
It's native.
Host: Tristan Hughes
Guest: Peter Heather (historian, author of Christendom)
Date: January 4, 2026
This episode explores one of history’s most dramatic religious and political transformations: the rise of Christianity in the Roman Empire during the 4th century. Tristan Hughes and historian Peter Heather discuss how a persecuted minor sect became the dominant faith, examining key figures, events, controversies, and the profound shift Christianity brought to both the empire and wider European culture.
[04:17–08:42]
"You can't get to 20%. That knocks that out... I don't see how you can get Christian numbers up above 1 to 2%." – Peter Heather [12:12]
[13:02–16:05]
"So they're all still floating around." – Peter Heather on the 4th century apocryphal texts [16:04]
[16:54–20:44]
“…a few hundred people are executed in the course of it … in the areas where Christianity had spread a bit more widely, the hot issue after it stops is what to do about lapsi—people who had sacrificed or handed over the Gospels.” – Peter Heather [17:02]
[22:56–31:32]
Constantine’s so-called conversion was a gradual, politically shrewd process—his public deity shifted with his victories.
"He absolutely is hedging his bets.” – Tristan Hughes [25:49]
His mother Helena and possibly his father’s sympathies may have played a part in his Christianizing tendencies.
His support didn’t immediately make paganism illegal, but raised Christianity’s profile and triggered a profound alignment with imperial power.
“God is certainly on his side, and this is what gives him the ideological clout to stand up and say... I’m Christian." – Peter Heather [29:14]
The Edict of Milan (313 AD) ended persecutions, but full Christianization was even more gradual.
[35:33–41:02]
“The emperor has been directly appointed by God. ... The emperor should have religious authority.” – Peter Heather [40:12]
[42:34–44:43]
“Julian's behavior makes me think about Constantine coming out... He comes out in stages.” – Peter Heather [42:56]
[50:49–58:08]
“…from the 380s is a first round of shutting down temples on a large scale.” – Peter Heather [52:09]
[59:32–63:23]
"What's different about Christianity is... it's actually interfering in the lives of everybody. That's very new." – Peter Heather [61:00]
"Christianizing the entire world is not a quick task." – Peter Heather [63:23]
[63:26–65:41]
“The thought that it was anything ever other than colossal, and that it might not have become so colossal. That is really hard to encompass when you first start thinking about it.”
– Peter Heather [04:17]
"Nicaea doesn't settle the argument. It's the start of the argument."
– Peter Heather [36:27]
“It's truly extraordinary... a process of evolution that … takes you back to the Bronze Age.”
– Peter Heather on the collapse of longstanding pagan traditions [66:40]
“Inserting a Christian presence into the physical landscape was a way of getting rid of the demons.”
– Peter Heather on the Christianization of pagan temples [67:25]
“The co-optation of Christianity into the apparatus of the Roman state is the crucial factor in its rise to prominence.”
– Interviewer quoting Heather, who affirms: “I think I wrote it.” [68:20]
| Timestamp | Segment | |--------------|----------------------------------------------------------------------------------------| | 04:17–09:02 | State of Christianity in 300 AD; population, urban/rural divide | | 13:02–16:08 | Diversity of Christian doctrine and texts; apocrypha | | 16:54–21:50 | Great Persecution and its effects | | 22:56–31:32 | Constantine’s conversion, political strategy, The Edict of Milan | | 35:33–41:02 | Power of emperors in shaping Christianity; Ecumenical councils | | 42:34–44:43 | The Julian Interlude; pagan resilience and elite pragmatism | | 50:49–58:08 | Attack on pagan temples; Theodosius and aggressive Christianization | | 59:32–63:23 | Suppression of paganism, rural conversion, church as imperial branch | | 63:26–65:41 | Romanization of Christianity, top-down councils and orthodoxy | | 66:40–67:58 | The scale of the transformation and Christianization of temples |
Throughout, Hughes and Heather maintain an engaging, accessible, and occasionally lightly humorous style, using analogies (Soviet state party, climate summits, “coming out” for faith) to drive clarity and interest.
The episode tracks Christianity’s extraordinary ascent from persecuted minority to dominant imperial faith, emphasizing:
It is a vivid account of how imperial politics, doctrinal disputes, and the machinery of Roman governance combined to reshape Europe’s religious landscape—less a story of inevitability than of contingency, calculation, and coercion.