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In page Hōjō Masako:

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In 1183, Yoritomo's rival and cousin Minamoto no Yoshinaka took Kyoto, forcing the Taira (and Emperor Antoku) to Shikoku. Soon after, Emperor Go-Toba was installed by the Minamoto. Minamoto no Yoshitsune and Minamoto no Noriyori, Yoritomo's half brothers who had joined the conflict on his side, drove Yoshinaka out of the capital and executed him, taking Kyoto in the name of Yoritomo (and the Hōjō[citation needed]).