During the Hogen War in 1156, Tameyoshi, in command of the clan, including his sons, MINAMOTO no Yorikata and Tametomo, was defeated fighting for Daijo-tenno (a retired emperor) against Yoshitomo and TAIRA no Kiyomori on the Emperor's side.
保元元年（1156年）、保元の乱では、為義は子の源頼賢、為朝ら一族を率いて太上天皇方につき、天皇方の義朝、平清盛らと戦うが敗れる。