Sie war auch die Schwester von Hōjō Yoshitoki, und war mit Minamoto no Yoritomo, dem ersten "Shōgun" der Kamakura-Epoche, verheiratet. ###>Nonetheless, Masako and Yoshitoki, the heir to the Hōjō, were angry with their father, especially after their mother, Hōjō no Maki, died in 1204.