In cooperation with Mochiuji ASHIKAGA, Kamakura kubo (Governor-general of the Kanto region) who had been in conflict with the shogunate in those days, Mitsumasa rose in revolt, being presided by Seisho.
満雅はこの当時幕府と対立していた鎌倉公方足利持氏と連合し、聖承を推戴して反乱を起こす。