Sadatsuna Sasaki

A military commander in the early Kamakura period. Son of Hideyoshi. His main territory was Sasaki Manor in Omi (Omihachiman City, Shiga Prefecture), but after the Heiji Rebellion (1159), he left his main territory and lived in Shibuya Manor in Sagami Province (near Fujisawa, Yamato, and Ayase City, Kanagawa Prefecture), where he often visited Minamoto no Yoritomo, who was exiled to Izu, on his father's orders. In 1180 (Jisho 4), he responded to Yoritomo's uprising and participated in the subjugation of the Satake clan at Hitachi Kanasa Castle (Hitachiota City, Ibaraki Prefecture), and was appointed as the land steward of his main territory, Sasaki Manor, and then became the guardian of Omi. In 1191 (Kenkyu 2), he fought with the monks of Enryaku-ji Temple over the tax from Sasaki Manor, which was to be used as offerings to the temple, and killed one of them. He was sued by Enryaku-ji Temple and exiled to Satsuma, but was pardoned the following year and allowed to keep his former territory. He died on April 9, 2nd year of Genkyu.

[Eiji Nitta]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

鎌倉初期の武将。秀義(ひでよし)の子。近江(おうみ)佐々木荘(しょう)（滋賀県近江八幡(はちまん)市）が本領であるが、平治(へいじ)の乱（1159）後、本領を離れて相模(さがみ)国渋谷(しぶや)荘（神奈川県藤沢・大和(やまと)・綾瀬(あやせ)市近辺）におり、父の命でしばしば伊豆に配流中の源頼朝(よりとも)を音問した。1180年（治承4）頼朝の挙兵に応じ、常陸(ひたち)金砂(かなさ)城（茨城県常陸太田(ひたちおおた)市）の佐竹氏討伐などに参加、戦功により本領佐々木荘の地頭に補され、ついで近江の守護となった。1191年（建久2）延暦寺(えんりゃくじ)の供料にあてらるべき佐々木荘の年貢をめぐって同寺の衆徒と争い、これを殺傷したことから延暦寺に訴えられ、薩摩(さつま)に流されたが、翌々年赦(ゆる)されて旧領を安堵(あんど)された。元久(げんきゅう)2年4月9日没。

［新田英治］

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