When Yasutoki returned to Kamakura because Yasutoki's father, Yoshitoki had died a sudden death (in June through July 1224), there was a coup by the Iga family triggered by Yasutoki's stepmother, Iga no Kata, which was intended to support her biological son, Masamura HOJO, as the next regent.
貞応3年（1224年）6月、父・義時が急死したため、鎌倉に戻ると義母の伊賀の方が実子の北条政村を次期執権に擁立しようとした伊賀氏の変が起こる。