When a dispute over irrigation occurred in 1322 between Masatsune IWAMATSU of Iwamatsu clan and Muneuji ODATE who was close to the head family, the dispute was left to the decision of the Kamakura bakufu.
元亨2年（1322年）に、一族の岩松氏系の岩松政経と本宗系に近い大舘氏の大舘宗氏が用水争いを起こした際、鎌倉幕府に裁定を持ち込んでいる。