北条時政
The same year a disillusioned Imperial Prince Mochihito, son of Emperor Go-Shirakawa, called on the Minamoto members remaining in Japan to overthrow the Taira. Mochihito thought the Taira had denied him the throne to offer the throne to Emperor Antoku, who was half Taira. Minamoto no Yoshitomo considered himself the head of the Minamoto and responded. He had the full support of the Hōjō and Hōjō Tokimasa, not to mention Masako. The Minamoto center was at the city of Kamakura, to the east of Izu in Sagami Province.