As the result of Jokyu War in 1221, the imperial court centering on the Retired Emperor Gotoba was defeated by the bakufu and all the lands of the aristocrats and samurais who were on the side of the Retired Emperor were confiscated.
1221年の承久の乱の結果、後鳥羽上皇を中心とする朝廷が幕府に敗れる事態となり、上皇方についた貴族・武士の所領はすべて没収された。