The Otate Rebellion

Japanese: 御館の乱 - おたてのらん

After the death of Uesugi Kenshin in 1578, Kenshin's adopted son Uesugi Kagekatsu (from the Ueda Nagao clan) and Uesugi Kagetora (son of Hojo Ujiyasu, lord of Odawara Castle in Sagami) fought over his succession. The war ended in 1580. Immediately after Kenshin's death, Kagekatsu entered the main citadel of Kasugayama Castle in Echigo (present-day Joetsu City, Niigata Prefecture), while Kagetora, who was in the second citadel, moved to Otate (the residence of former Kanto Kanrei Uesugi Norimasa) and confronted him. At first, Kagetora, who was supported by many of Kenshin's hatamoto, had the upper hand. However, at the request of Hojo Ujimasa (Kagetora's older brother), Takeda Katsuyori of Kai, who sent troops to rescue Kagetora, made peace with Kagekatsu, and Kagekatsu gradually established military superiority thereafter. In 1579, Uesugi Norimasa, who attempted to mediate, was killed by Kagekatsu's soldiers, and Kagetora also tried to escape to Odawara, but failed and committed suicide. The local lords on Kagetora's side continued to resist, but were subdued in 1580. Following his victory, Kagekatsu reorganized his vassals, centering on the Ueda clan, and established a foundation for governing his domain.
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Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

1578年上杉謙信の没後，その後継を謙信の養子上杉景勝（上田長尾氏の出身）と上杉景虎（相模小田原城主北条氏康の子）が争った戦乱。1580年に収束。景勝は謙信没後すぐに越後春日山城（現新潟県上越市）の本丸実(み)城に入り，二ノ丸に居た景虎は御館（前関東管領上杉憲政の居館）に移って対峙する。初め謙信旗本衆の多くが支持した景虎が優勢。しかし北条氏政（景虎の兄）の要請で景虎救援に出兵した甲斐武田勝頼が景勝と和睦，その後は景勝が徐々に軍事的優位を確立。1579年仲裁を企図した上杉憲政が景勝の兵に殺され，景虎も小田原への脱出を試みたが，失敗して自刃。景虎方の国人は以後も抗戦したが，1580年に平定。勝利した景勝は上田衆を中心に家臣団を再編，領国統治の基盤を確立。
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