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In page Hōjō Masako:

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Yoritomo's allegiance to his wife's family and her dislike of her brothers-in-law, as well as an internal power struggle brought on by the three brothers, eventually resulted in the arrest and execution of Yoshitsune and Noriyori.[citation needed] Yoritomo bestowed the titles of shugo and jitō on loyal followers to undermine Emperor Go-Shirakawa's authority and the central government's control in the provinces while Kyoto was relegated to a ceremonial role and power shifted to center around Kamakura.