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There are more ways than ever to listen to History Daily ad free. Listen with Wondry plus in the Wondery app as a member of Noiser plus at noiser.com or in Apple Podcasts. Or you can get all of History Daily plus other fantastic history podcasts at intohistory.com It's July 324 CE off the coast of Asia Minor, now known as Turkey, whiffs through the air as Flavius Julius Crispus grips the rail of his ship. Waves thump against the hull, but there's no turning back. Crispus knows that he must ignore the risk of capsizing and advance into the choppy waters if he is to have any chance of victory over the enemy. The Roman Empire has slipped into civil war, with rival leaders vying for power. Crispus fights for his father Constantine, and today he's facing the navy of Constantine's adversary, Licinius. Crispus must break through if his father is going to conquer Licin, his stronghold in the eastern provinces. But as Crispus pushes his ship on, an enemy vessel suddenly emerges through the spray. It's nearly twice the size of Crispus ship, but it's far slower, and that gives Crispus an opportunity. He barks out orders and feels the deck beneath him shudder as the ship turns sharply. Crispus unsheathes his sword and dozens of other soldiers on deck follow suit. He silently counts down the last few yards and until eventually the two ships collide and a pitched battle erupts in the middle of the churning sea. By exploiting the stormy waters, Flavius Julius Crispus will shatter the enemy fleet. The civil war in the Roman Empire won't end there, but victory at the Battle of Hellespont will clear the path for Crispus father Constantine to march on, setting up a final, decisive battle at Chrysopolis on September 18th. 324. Cel.
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From Noiser and airship. I'm Lindsey Graham and this is History. Daily history is made every day on this podcast. Every day, we tell the true stories of the people and events that shaped our world. Today is September 18th, 324 CE, the Battle of Chrysopolis. It's spring, 303 CE, just outside the city of Nicomedia in the eastern Roman Empire, 21 years before the Battle of the Hellespont. Constantine rides toward the city at the head of his elite cavalry unit. His horse kicks up dust as a palace comes into view. After several years campaigning on the Roman empire's frontiers, the 30 year old Constantine is looking forward to a break from war and to all the comforts reserved for a nobleman of his rank. But a commotion at the side of the road catches his eye. A cluster of travelers huddles just off the highway, their wrists bound and eyes downcast. Soldiers rifle through their cart, emptying sacks and chests, searching for something. As Constantine draws nearer, one of the rummaging soldiers shouts in triumph. He lifts a gold cross from a sack and it glistens in the sunlight. The traveler's heads sink, knowing that their fate is sealed. The soldier has just found proof that they are Christians. At the turn of the 4th century, no religion in the Roman Empire is growing faster than Christianity. Although its various sects differ in their practices, they all share one core belief, that there is only one God. This puts them at odds with the traditions of the Roman Empire, where worshipping many gods is the norm. And while some emperors have tolerated Christians treating their God as just another deity among hundreds, other rulers have been more suspicious. And now it seems that the Christians are being targeted by the authorities. Once again, Constantine reins in his horse. As he approaches the Christians at the side of the road, most glare at him with undisguised resentment. But one woman meets his gaze, eyes pleading and begging for help. Constantine hesitates, unsure what to do. As far as he's concerned, the Christians have done nothing wrong and don't deserve to be persecuted. But he doesn't feel he can get involved before he knows more about what's happening here. So Constantine just tightens his jaw and rides on, leaving the woman and her companions to their fate. A few minutes later, Constantine reaches the palace. There he learns that the soldiers outside were acting on the orders of Emperor Diocletian himself. He has commanded his men to destroy Christian dwellings, burn scriptures and seize artifacts. But although Constantine is troubled by this latest bout of persecution, he decides he has no right to intervene on the road if it is an imperial order. There's nothing he can do. Speaking out would only cause trouble, not just for himself, but also for his father. And that could be catastrophic for the entire empire. Seventeen years ago, Emperor Diocletian radically overhauled the governance of the Roman world. Managing Rome's vast territories had become seemingly impossible for one man alone. So Diocletian split the empire in two, appointing a co emperor to rule in the west while he ruled in the East. Soon after, he added two junior emperors to lighten the administrative load even further. This system is known as the Tetrarchy. And right now, Constantine's father is the junior emperor in the West. That makes him an important figure and puts Constantine on guard. He doesn't want to make life difficult for his father by doing anything rash. Still, in the tumultuous Roman Empire, no one ever has a secure grip on the throne. And two years later, the delicate power sharing agreement is put to the test. In May 305 CE, Diocletian falls ill and retires from his position as ruler of the Eastern Empire. But now that there are multiple emperors, there is no obvious line of succession. And within weeks, Diocletian's absence sets up a struggle for power. Constantine's father emerges as the senior emperor in the west and army General Galerius takes over in the East. But that leaves Constantine feeling vulnerable. He hears whispers that Galerius considers him a potential rival. Fearing assassination, Constantine decides to escape the court of Galerius and join his father in the West. So one night, when Galerius is drinking heavily in the palace, Constantine secretly saddles a horse and gallops away before anyone can stop him. He flees west, riding as fast as he can, pausing only to snatch a few hours sleep at the homes of trusted allies. Eventually, Constantine reaches the safety of his father's court in the distant province of Britain. Father and son spend the next year fighting on the remote northern frontier of the empire until July 306 CE, when Constantine's father is killed in battle. His father's soldiers immediately proclaim Constantine as the new emperor in the West. But not everyone will accept Constantine's claim to the throne. His legitimacy will soon be challenged and his armies will be forced to march again, fighting their fellow Romans. And the prize will be ultimate power. History Daily is sponsored by. Indeed, back in 1999, I remember reading Bill Gates book business at the speed of thought. 25 years later, and, well, the speed of business has only increased. And that includes hiring. You can't sit around waiting for paper resumes to filter in. You need to find quality candidates right now because opportunity waits for no one. Which is why when it comes to hiring, Indeed is all you you need. Their sponsored jobs help you stand out and hire fast. They get your post to jump to the top of the page for your relevant candidates so you can reach the people you want faster and it makes a huge difference. 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It's October 29, 312 CE near Rome, six years after Constantine was proclaimed the Western Roman Emperor. Constantine rides at the head of his troops toward the Milvian Bridge, an important crossing point on the river Tiber just north of Rome. Wearing heavy armor, he steadies himself and looks to each side, taking in his column of soldiers. They are all weary from lack of sleep, but their heads are held high and Constantine sees in their eyes a fiery belief that they will win a decisive victory today. For the past year, Constantine has been waging a war against a rival named Maxentius. A few months ago, Constantine marched his men through the Alps and moved south through Italy. One by one, cities fell to his army and Maxentius was forced to retreat further south. But Maxentius has been able to hold on to power thanks to his control of Rome. Now, though, both men know that the next battle will be decisive because it will decide who rules the empire's capital. But despite his soldiers bravado, the odds seem to be against Constantine. Maxentius men outnumbers his two to one. Maxentius also had time to dig defensive earthworks and stockpile weapons and supplies, while Constantine's army is tired from weeks on the road. Still, Constantine shows no hesitation because he claims he's received a sign of divine favorite. Last night, Constantine tossed and turned as dreams interrupted his sleep. When he woke in the early hours, he said he could clearly remember one vivid vision in the sky. Blazing in sunlight, Constantine had seen a symbol commonly used by Christians. The first two Greek letters in the word Christ superimposed on one another to make a cross like pictogram. Although he is not a Christian, Constantine felt compelled to adopt the symbol. To him it was a clear sign from the heavens. So he ordered his troops to be woken before dawn to give them time to daub their shields with the new design. Now, as they line up to await orders, Constantine can see the freshly painted sigil glinting in the sunlight. Confident that his troops are protected by divine favor, Constantine orders his cavalry to charge. The first column breaks through the enemy lines, forcing Maxentius troops back toward the Milvian Bridge. Discipline breaks down as Maxentius soldiers flee for their lives. And although most cannot swim, many jump into the river in their desperation to escape. Even Maxentius himself ends up in the water and his fate is the same as his soldiers, drowned under the weight of his armor. Once victory is certain and the last enemy fighters are captured or killed, Constantine orders Maxentius body to be pulled from the river. There, on the banks of the Tiber, Maxentius is posthumously decapitated. And only hours later, Constantine's army marches into Rome, parading the head through the streets. Then the Roman Senate declares that Constantine is the rightful emperor, finally cementing his authority over the Western empire. From his new seat of power in Rome, Constantine becomes convinced that it was the Christian God who carried him to victory. And he believes that he has been given a mission to expand the Christian faith throughout the empire. Still, Constantine is politically astute enough not to force the issue. He knows that the majority of his citizens are not Christian and he is careful not to persecute them. Instead, Constantine allows the two religions to coexist using symbols and imagery from both Roman traditions and Christianity and refusing to publicly reveal his own personal faith. This way, all citizens of the west can claim him as one of their own and peace can reign. But the same cannot be said of the other half of the Roman Empire in the east, persecution of Christians continues in many regions. So the year after the Battle of the Milvian Bridge Constantine meets with his counterpart, the new Eastern Emperor Licinius to hammer out an agreement. The results of their talks is the Edict of Milan. It repudiates the policies of the old Emperor Diocletian and grants Christians new legal protections that officially recognize their faith and as a legitimate religion. Throughout the Empire, a new age of harmony and tolerance seems within reach. But only seven years later, in 320 CE, Licinius will go back on his word and resume his attacks on Christians. This will spur Constantine into one last military campaign to seize absolute control over the Roman Empire and end the power sharing tetrarchy once and for all.
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It's dawn on September 18, 324 CE in Chrysopolis, 12 years after the Battle of the Milvian Bridge. Emperor Constantine emerges from his tent as the first light of day spills across camp. Waiting for him are his top military officers, each expecting orders for the upcoming battle. But Constantine's gaze fixes on the horizon where the ranks of Licinius army stretch out in an unbroken line. Then without a word, Constantine turns and disappears back inside his tent. There he drops to his knees and begins to pray. A few days earlier, a messenger arrived at Constantine's camp with news of an important victory. His eldest son, Flavius Julius Crispus has defeated Licinius navy in the Hellespont. The sea now lay open, clearing Constantine's path to the east where the bulk of Licinius army can be found. Constantine ordered his troops to march and now they are within striking distance of Licinius troops at Chrysopolis Slowly, Constantine rises from one knee after he finishes praying. Then he orders a direct assault on Licinius army. The fighting is brutal and unrelenting. Constantine's soldiers have the advantage of the higher terrain, but Licinius refuses to yield and he sends unit after unit into the breaches in his line. The battlefield is soon littered with the dead and dying. And by the time the fighting ends, more than 25,000 of Licinius soldiers have fallen. Yet Licinius himself escapes and rallies his remaining forces in the city of Nicomedia. But rather than prolong the bloodshed, Constantine sends his sister to broker peace. Eventually, Licinius agrees to relinquish power in exchange for his life. And Constantine becomes emperor of both the Western and Eastern Roman Empire. With his enemies crushed and ultimate power in his hands, Constantine is ruthless. He reneges on the deal he struck with his defeated enemy and Licinius is put to death. With no one left to challenge his authority, Constantine becomes the first Roman emperor in decades to rule alone. He will use his power to make sweeping changes, moving the capital from Rome to a new city he names after himself Constantinople. And from his new palace there, he will actively promote the Christian religion, fostering the rapid growth of the faith across the empire. By the time Constantine dies in 337 cell, Christianity will have transformed from a fringe cult to a mainstream faith, having been given a crucial foothold by Constantine's victory at the Battle of Chrysopolis on September 18, 324 CE. Next on History Daily September 19, 1868. White supremacists attack a peaceful march protesting the expulsion of black politicians from the Georgia state legislature. From Noiser and Airship, this is History Daily. Hosted, edited and executive produced by me, Lindsey Graham. Audio editing by Mohammad Shazi Sound design by Molly Bog Music by Thrum this episode is written and researched by Dorian Marina. Edited by Scott Reeves Managing producer Emily Burke Executive producers are William Simpson for Airship and Pascal Hughes for Noiser.
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Host: Lindsay Graham
Airdate: September 18th, 2025
Podcast: History Daily (Airship | Noiser | Wondery)
This episode of History Daily immerses listeners in the dramatic conclusion of Rome’s great civil war—the Battle of Chrysopolis on September 18th, 324 CE. Chronicling the final struggle between Constantine the Great and his rival Licinius, host Lindsay Graham explores the events that wrested the empire’s fate from the shifting hands of co-emperors and paved the way for Christianity’s ascendancy in Rome. Through vivid storytelling and keen historical analysis, the episode traces major battles, personal decisions, political maneuvers, and the enduring consequences of Constantine’s rise.
“Crispus knows that he must ignore the risk of capsizing and advance into the choppy waters if he is to have any chance of victory over the enemy.”
“As far as he’s concerned, the Christians have done nothing wrong and don’t deserve to be persecuted. But he doesn’t feel he can get involved before he knows more about what's happening here.” (06:05)
An atmosphere of paranoia and ambition:
“He hears whispers that Galerius considers him a potential rival. Fearing assassination, Constantine decides to escape the court of Galerius and join his father in the West.” (08:04)
Constantine’s early rule is fraught with conflict and contention for legitimacy, setting up years of civil wars with other contenders.
“Although he is not a Christian, Constantine felt compelled to adopt the symbol. To him it was a clear sign from the heavens.” (11:38)
“From his new seat of power in Rome, Constantine becomes convinced that it was the Christian God who carried him to victory. And he believes that he has been given a mission to expand the Christian faith throughout the empire.” (13:19)
“But Constantine’s gaze fixes on the horizon where the ranks of Licinius army stretch out in an unbroken line. Then without a word, Constantine turns and disappears back inside his tent. There he drops to his knees and begins to pray.” (15:55)
“With no one left to challenge his authority, Constantine becomes the first Roman emperor in decades to rule alone. He will use his power to make sweeping changes, moving the capital from Rome to a new city he names after himself—Constantinople.” (18:15)
“By the time Constantine dies in 337, Christianity will have transformed from a fringe cult to a mainstream faith, having been given a crucial foothold by Constantine’s victory at the Battle of Chrysopolis on September 18, 324 CE.” (19:10)
Describing Crispus’ naval tactics:
“He silently counts down the last few yards and until eventually the two ships collide and a pitched battle erupts in the middle of the churning sea.” (01:10)
On Constantine witnessing Christian persecution:
“One woman meets his gaze, eyes pleading and begging for help. Constantine hesitates, unsure what to do... So Constantine just tightens his jaw and rides on, leaving the woman and her companions to their fate.” (06:00)
Emperor’s doubts in the midst of war:
“Constantine’s gaze fixes on the horizon…Then without a word, Constantine turns and disappears back inside his tent. There he drops to his knees and begins to pray.” (15:55)
Constantine’s resolve post-victory:
“With his enemies crushed and ultimate power in his hands, Constantine is ruthless. He reneges on the deal he struck with his defeated enemy and Licinius is put to death.” (18:05)
Lindsay Graham delivers the episode in an immersive, cinematic style—balancing vivid battle descriptions, subtle psychological insight, and thoughtful political analysis. The narrative remains focused, dramatic, and respectful to the complexity of historical figures, building suspense even as it delivers well-known facts.
This episode of History Daily provides a gripping, multi-layered recounting of the events leading to and resulting from the Battle of Chrysopolis. Skillfully weaving together military exploits, religious transformation, personal dilemmas, and political context, it illuminates why Constantine’s victory on September 18th, 324 CE—won through both martial excellence and merciless calculation—was not just a triumph of a single emperor but a turning point for world civilization. The decisive nature of this day, its lasting impact on the birth of Christian Rome, and the enduring legacy of Constantine are brought to life with dramatic tension and historical depth.