In 1266, in cooperation with Regent Masamura and a powerful member of the family, Sanetoki HOJO, he removed the Imperial Prince Munetaka who was alleged to have plotted a rebellion against the bakufu, and sent him back to Kyoto, replacing him with the Imperial Prince Koreyasu.
執権政村や一族の重鎮北条実時と協力して、文永3年（1266年）に幕府転覆を計画していたとされる宗尊親王の廃位と京都送還、惟康親王の擁立などを行った。