Yorimasa took sides with the winners in the Hogen and Heiji Disturbances, and after the wars, he stayed active in the national political arena as a patriarch of the Minamoto clan under the Taira administration.
保元の乱、平治の乱で勝者の側に属し、戦後は平氏政権下で源氏の長老として中央政界に留まった。