In 1156, with the death of Cloistered Emperor Toba, he planned to usurp political power and brought together samurai warriors (including Minamoto no Tameyoshi, TAIRA no Masatada and MINAMOTO no Yorinori) at Retired Emperor Sutoku's Gosho Shirakawadono (Imperial Palace).
1156年、鳥羽法皇が崩御すると政権奪取を図り、崇徳上皇の御所白河殿に源為義・平忠正・源頼憲らの武士を集めた。