Minamoto no Yoriie
In 1199, Minamoto no Yoritomo died. He was succeeded as "shōgun" by his son, Minamoto no Yoriie. Since he was only eighteen, Hōjō Tokimasa proclaimed himself "shikken" or regent for Yoriie. Masako also had a strong position since her son was "shōgun". Since her husband was dead, she shaved her head and became a Buddhist nun, receiving a tonsure from the priest Gyōyū. However, she did not take up residence in a monastery or a nunnery, and still involved herself in politics. Along with her father Tokimasa and her brother Yoshitoki, Masako created a council of regents for the eighteen-year-old Yoriie. The headstrong "shōgun" hated his mother's family and preferred his wife's family, the Hiki clan, and his father-in-law, Hiki Yoshikazu.