After the demise of the Cloistered Emperor Toba, Hogen Disturbance took place in 1156, and Yorimasa took sides with the Emperor supported by Bifukumon-in and successfully remained on the winner's side.
鳥羽法皇崩御後、保元元年（1156年）に保元の乱が起こると、頼政は美福門院が支持する天皇方に与し、勝者の側となれた。