1491: The Death of Horikoshi Kubō Ashikaga Masatomo - Sengoku Shogun Map
Ashikaga Masatomo, the Horikoshi Kubō overseeing Izu, died of illness, and a succession struggle erupted when his eldest son Chachamaru killed his stepmother and half-brother to seize the position. This unrest would directly trigger Hōjō Sōun's invasion of Izu two years later. In Ōmi, shogun Yoshiki launched a second campaign against Rokkaku Takayori, who fled into the mountains of Kōga.
Major events
- 1491-月日不詳: Death of Ashikaga Masatomo and the Horikoshi Kubō Succession Crisis — After Horikoshi Kubō Ashikaga Masatomo died of illness, Chachamaru killed his half-brother and the boy's mother and seized control of the residence, bringing the succession crisis into the open.
- 1491-08: The Second Campaign Against the Rokkaku Begins — Tenth shogun Ashikaga Yoshiki sent forces into Ōmi and took the field himself to begin a second campaign against Rokkaku Takayori.
- 1491-10: Uesugi Fusasada Dies — Shugo Uesugi Fusasada, who had governed Echigo while supporting the Uesugi in the Kantō, died, marking a transition in Echigo's provincial leadership.