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The wider storyWhy did the Ōuchi military establishment stage a coup against their own lord?This analysis examines the internal friction within the Ōuchi clan that precipitated the 1551 coup. It details how Yoshitaka's plan to relocate the imperial court to Yamaguchi alienated his military deputies, leading…Read the full history | Event | Sue Takafusa forces Ōuchi Yoshitaka to commit suicide |
|---|---|
| Date | September 30, 1551 |
| Location | Tainei-ji, Nagato Province |
| Key Figure | Sue Takafusa |
| Source Detail | Ōuchi Yoshitaka was the hegemon and shugo daimyō of western Japan |
| Confirmed Outcome | Ōuchi Yoshitaka was forced to commit suicide |
Timeline: the road to Sue Takafusa and its aftermath
- March 27, 1551 Emperor Go-Nara appoints Ōuchi Yoshitaka as Acting Governor of Yamashiro
- End of the eighth month of 1551 Nearly the entire court moves to Yamaguchi, excluding the emperor and palace ladies
- September 30, 1551 Sue Takafusa forces Ōuchi Yoshitaka to commit suicide at Tainei-ji
- September 1551 The coup dismantles the Ōuchi clan's dominance in western Japan
- September 1551 Ōuchi Yoshinaga assumes the role of figurehead leader for the clan
The Clash and the Stakes
The political upheaval concluded with Yoshitaka's forced suicide at Tainei-ji, a temple located in Nagato Province.
The coup dismantled the Ōuchi clan's dominance in western Japan, ending a period of prosperity that had seen the city of Yamaguchi attract Chinese merchants and Jesuit missionaries under Yoshitaka's patronage.
Reports From the Front
On March 27, 1551, Emperor Go-Nara appointed Ōuchi Yoshitaka as Acting Governor of Yamashiro. This appointment placed Yoshitaka in a position of significant influence over the imperial capital, Kyoto.
Following this appointment, Yoshitaka initiated a plan to relocate the emperor and the court to Yamaguchi. By the end of the eighth month of 1551, nearly the entire court had moved to the city, excluding only the emperor and palace ladies.
The Military and Political Fallout
Although the family continued to rule western Japan in name for another six years, this period was marked by the installation of a figurehead leader rather than direct control by the original lineage.
The figurehead who assumed the role was Ōuchi Yoshinaga. He was not related to the Ōuchi by blood, a detail that underscores the disconnect between the clan's nominal authority and its actual political standing after the incident.
How the Balance of Power Shifted
At their height, the Ōuchi domains comprised six provinces, a scope of influence that defined their status in the region. The events of September 1551 severed the connection between this territorial reach and the leadership of Ōuchi Yoshitaka.
Yoshitaka had fostered a close relationship with Emperor Go-Nara in Kyoto, a bond that had elevated the clan's prestige. The forced suicide at Tainei-ji ended that specific line of patronage and left the clan's future dependent on a non-blood relative.
Evidence Map: How We Checked the Central Claim
What the sources verify and how they were used
This comparison separates the event page selected for the account from the independently verified page used to corroborate it.
Central claim checked: A coup by the military establishment of Japan's Ōuchi clan forces their lord to commit suicide, and their city is burned.
| Direct source | Verification role | Coverage |
|---|---|---|
| Tainei-ji incident · Wikipedia Accessed 2026-09-29 | Selected event record | Supports the central claim shown above. |
| The Failed Attempt to Move the Emperor to Yamaguchi and the Fall of the Ōuchi · zenodo.org Accessed 2026-09-29 | Independent corroboration | Supports the central claim shown above. |
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Questions readers ask about Tainei-ji incident
The recorded event date is September 30, 1551.
Key figures included Ōuchi Yoshitaka, Sue Takafusa.