Moriyama Incident
The Moriyama Incident (Japanese: 森山崩れ, もりやまくずれ, Moriyama kuzure[*]) was the assassination of Matsudaira Kiyoyasu, lord of Okazaki Castle in Mikawa Province, Japan, by his retainer Abe Yashirō Masatoyo in Moriyama, Kasugai District, Owari Province, on the morning of December 4, 1535. The original Jap
Start Dec 29, 1535Last edited Oct 15, 2026, 2:51 PM
Moriyama Incident (Japanese: 森山崩れ, もりやまくずれ, Moriyama kuzure[*]) was the assassination of Matsudaira Kiyoyasu, lord of Okazaki Castle in Mikawa Province, Japan, by his retainer Abe Yashirō Masatoyo in Moriyama (present-day Moriyama-ku, Nagoya, Aichi Prefecture), Owari Kasugai District, on the morning of December 4, 1535. The original Japanese name, Moriyama kuzure, means "the collapse of Moriyama." After Kiyoyasu's assassination, the Matsudaira clan lost its strength, and Matsudaira Hirotada, who succeeded him as head of the family, was forced to send his eldest son Takechiyo as a hostage to the nearby powerful Imagawa clan.
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Last edited Oct 15, 2026, 2:51 PM · r79009 · Text is available under CC BY-SA 4.0.