In 1180 as the result of the Jisho, Juei War, the Kamakura bakufu (Japanese feudal government headed by shogun) was established in the eastern province and had their own right to rule the government, however Gotoba who had the absolute power to direct a despotic government as Chiten, he could not stand the existence of the bakufu.
1180年代の治承・寿永の乱の結果、東国に鎌倉幕府が成立し、独自の支配権を獲得していたが、治天として専制を指向する後鳥羽には、幕府の存在が我慢ならないものだった。