Minamoto no Sanetomo
Later on, Minamoto no Sanetomo, Yoritomo's second son, became shogun. Tokimasa ruled as regent for him also, but he fell out with the Hōjō, and Tokimasa plotted to have him executed. During this period, a certain Hatakeyama Shigetada, Yoshitoki's brother in law who had married his sister (not Masako) was executed by Tokimasa's men, on false charges of treason. Yoshitoki had been close with him, and began to distrust his father. When there were plans to have Sanetomo executed also, Masako and Yoshitoki ordered their father to abdicate or they would rebel. Tokimasa shaved his head, became a monk, and retired to a monastery/nunnery in Kamakura, only dying in 1215.