However, becoming dominant by winning the Jokyu war in 1221, the bakufu came to participate in the watch of the Imperial court as well as in deciding the person who would inherit the title of emperor, extending its control rights by advancing into the Saigoku region.
しかしながら、承久3年（1221年）の承久の乱の勝利によって幕府が優勢となり、朝廷の監視や皇位継承者の決定への参与、西国への進出により支配権を広めていく。