When the regent Tsunetoki died in 1246, Tsunetoki's younger brother Tokiyori HOJO took over the position of a regent, which triggered a coup (palace disturbance), and Mitsutoki NAGOE and FUJIWARA no Sadakazu were overthrown by the failure of the coup.
寛元4年（1246年）に執権経時が死去し、弟の北条時頼が執権を継承したのを機に勃発した政変（宮騒動）によって名越光時・藤原定員が失脚する。