After the Mongol invasions of Japan of 1274 and 1281, the Kamakura Bakufu, which turned to the tokuso (the title held by the head of the mainline Hojo clan, who monopolized the position of regents of the Kamakura shogunate) dictatorship, gradually began to oppress the other Gokenin (Shogunal retainers), resulting in increasing dissatisfaction among people.
元寇以来、得宗専制に走った鎌倉幕府は次第に他の御家人を圧迫するようになり、社会に不満が溜まるようになる。