After that, he played an important role in the Kamakura bakufu (Japanese feudal government headed by a shogun) as a member of the Minamoto clan, but he was suspected of rebellion and murdered.
その後も源氏一門として、鎌倉幕府において重きをなすが、のちに頼朝に謀反の疑いをかけられ誅殺された。