Emperor Antoku
In 1183, Yoritomo's rival and cousin Minamoto no Yoshinaka took Kyoto, forcing the Taira (and Emperor Antoku) to Shikoku. Quickly, Emperor Go-Toba was installed by the Minamoto. Nonetheless, Minamoto no Yoshitsune and Minamoto no Noriyori, Yoritomo's half brothers who had joined Yoritomo drove Yoshinaka out and executed him, and took Kyoto in the name of Yoritomo (and the Hōjō.)