Happy New Year! This is our 2025 recap episode. In this case, we actually are recapping a fair bit more than just the year, going over the previous evolution of the Yamato state up to the period of the Great Change, or Taika, which we covered this past year. There's a lot more that we expect to get into this next year, and this will hopefully tee us up for what is to come.

For more, including a full list of our previous references, check out: https://sengokudaimyo.com/podcast/episode-newyear2025

Rough Transcript

Shinnen Akemashite! Happy New Year and Welcome to Sengoku Daimyo’s Chronicles of Japan. My name is Joshua, and this is the New Year’s Recap episode for 2025!

It’s that time again: we are going to look back at what happened in the episodes this year. That was only episodes 101 to 117—we’ll skip the travelogue episodes for the time being. This covered the years of the early to mid-7th century, from roughly 613 to 659. That is easily within the lifetime of a single individual, and yet a lot was going on.

At the start of this year, we were at the height of Soga power. In 2023, we covered how back in 587, Soga no Umako had wrested power away from the powerful Mononobe clan, defeating Mononobe no Moriya. As you may recall, the sovereign known to posterity as Jimmu Tennou was the descendant of the Heavenly Grandchild known as Ninigi no Mikoto, at least according to the Nihon Shoki. The Mononobe clan claimed descent from none other than Nigi Hayahi, the Other Heavenly Grandchild, whose offspring were said to have been defeated by Jimmu.

You may recall that scholars generally consider the story of Jimmu, and the nine sovereigns that immediately followed him, as almost certainly a later addition to the story of the royal lineage. So when did the story of Nigi no Hayahi’s defeat enter the picture? And was its inclusion perhaps related to the defeat of the Mononobe by the Soga family? A family that successfully intermarried with the Royal House, themselves, such that all later sovereigns would trace their ancestry back to the Soga house?

Of course, under Soga dominance we saw the rise of figures like the Soga descended Kashikiya Hime, aka Suiko Tenno. During her reign, major reforms were carried out, Buddhism became fully established by the State, and ties with the continent were strengthened.

Politics would continue to be dominated by Soga, even after the death of Soga no Umako and Kashikiya Hime, with Soga no Emishi taking up the mantle of Prime Minister, working closely with his son, Soga no Iruka. The Soga family was so entwined with the politics of rulership that the main rivals of the Soga were… the Soga. That is to say different Soga-descended lineages, like that of the Prince Umayado, aka Prince Shotoku. Rather than supporting Umayado’s son, Prince Yamashiro no Oe, Soga no Emishi backed another candidate to the throne, Prince Tamura. , of the royal Okinaga lineage. Tamura came to power as Jomei Tenno, but there is little doubt that Soga no Emishi was the one in control.

Later, when Tamura passed away in 641, Yamashiro no Oe continued to be passed over. In fact, Soga no Emishi supported the ascension of Tamura’s wife, Takara hime, over Yamashiro no Oe, and there is evidence that he supported a prince known as Furubito no Oe as the Crown Prince and eventual successor. All of the evidence—which, to be honest, is rather biased—suggests that the Soga family were setting up a series of puppet rulers who would do their bidding, or at least be pliable to their suggestions.

There must have been some pushback, though, especially when one considers how strong the cult of Prince Shotoku, aka Umayado, would eventually become. One imagines that Prince Yamashiro was another pole around which those who opposed the Soga family could rally. After all, he was the son of Crown Prince Umayado, and likely had just as much of a claim as Tamura and his children. And so, to counter this threat, Soga no Emishi’s son and successor, Soga no Iruka, took matters into his own hands.

In a brazen display of the violence of court politics, Soga no Iruka had Yamashiro no Oe accused of plotting against the throne and took an army to arrest him—no doubt in the hope that the prince would resist. Eventually they cornered Yamashiro and his family, who committed suicide rather than submit.

This attack was likely targeted to take out the rival to the Soga family’s preferred Crown Prince, Prince Furubito no Oe, but rather than quell any dissent, the move seems to have enflamed the passions of those who wanted to see an end to the Soga house. Those passions took particular root in none other than Furubito no Oe’s younger brother, Prince Naka no Oe. Together with the support of his uncle, Prince Karu; the head of the Nakatomi house, Nakatomi no Kamatari; as well as another scion of the Soga house, Soga no Kuroyamada, Prince Naka no Oe staged a coup d’etat. Using the death of Prince Yamashiro no Oe as an excuse, they engineered a plot to assassinate Soga no Iruka in court, in front of Naka no Oe’s own mother, Takara Hime no Oho-kimi. After Iruka’s death, Naka no Oe and his supporters then took the fight to Soga no Emishi, who committed suicide and set his own house on fire in what came to be known as the Isshi Incident.

This shocking assassination caused Takara hime to step down. The Soga-backed Prince Furubito no Oe, rather than stepping up and taking the throne, retreated to a Buddhist temple and took holy orders, effectively retiring and theoretically taking himself out of court politics. That left Prince Naka no Oe and his uncle, Prince Karu, as possible candidates.

We are told that Prince Naka no Oe declined to take the throne himself, instead supporting his uncle, Prince Karu. Prince Karu took the throne, and is known to us as Kotoku Tenno, today. Prince Naka no Oe stepped up as the Crown Prince, and with the help of his co-conspirators, such as Nakatomi no Kamatari, Soga no Kurayamada, and others, they began a project to remake the Yamato government, using continental models—specifically the Sui and Tang courts, which were also influencing the governments of the Korean peninsula, such as those of Baekje and Silla.

This is known as the Taika, or Great Change, era. There had been previous movements to adopt some of the continental trends, but nothing to this extent, which culminated in a tremendous palace complex built in Naniwa—modern Ohosaka. Governors were sent out to the east of the country. The old, decentralized system was being replaced by a centralized bureaucracy.

And yet this wasn’t entirely a smooth transition. Early on there was a threat by supporters of the previous Crown Prince, Furubito no Oe. He was killed to put down any possible revolt. Later, Naka no Oe was hoodwinked into going after his own co-conspirator, Soga no Kurayamada, resulting in Kurayamada’s death and the punishment of his entire family. A few years later, Naka no Oe moved back to Asuka, taking most of the royal family and the court with him, abandoning the grand government complex that they had built in Naniwa for reasons that remain unclear.

Shortly thereafter, Karu, aka Kotoku Tenno, passed away. But rather than Naka no Oe taking the throne—or even Karu’s son, Prince Arima—the throne went back to Naka no Oe’s mother, Takara Hime. This is the only case we have of a single sovereign reigning twice, and the Chroniclers gave her two separate regnal names—Kogyoku Tenno to refer to her first reign and Saimei Tenno to refer to her second.

And this is the reign that we are going to start the new year with.

Beyond what was going on on the archipelago, there was also plenty that we covered on the continent. We started the year with the Sui dynasty having consolidated control and working to continue to expand their territory north, south, and west, while also connecting the economic areas of the Yangzi and Yellow rivers.

Unfortunately, through their wars and public works projects they overextended themselves, and the dynasty fell, replaced, in 619, with the Tang dynasty. The Tang continued to expand, taking control of important points on the Silk Road and becoming a hub of trade and commerce. At the same time, they were contesting their borders with the Goguryeo, who, themselves, had come under the control of Yeon Gaesomun, an infamous noble and anti-Tang hard-liner, who had staged a coup, murdered the Goguryeo king and any who stood against him, and who had installed a puppet king on the throne. It is little wonder that the Tang dynasty was courting Goguryeo’s enemy, Silla, to pressure them from the other side. This eventually kicked off the Tang-Goguryeo war, with the loosely allied Tang and Silla fighting on and off with Goguryeo and their ally, Baekje, who was also invested in stifling Silla’s ambitions on the peninsula.

So that’s where we are: The Korean peninsula is currently embroiled in conflict between the three kingdoms on the peninsula and the nearby superpower, the Tang Dynasty. Meanwhile, Yamato, on the archipelago, is going through a whole… thing. What that is, we’ll try to get into over the next year.

Given all of this, let’s go over some of the themes from the past year. To start with, let’s talk about expanding Yamato influence.

From what we can tell, Yamato’s influence in the archipelago had pe...