In Mikka Heishi no ran (the three-day rebellion of the Taira clan) in July 1184 (Heian period), he set out to subdue the rebellion with his youngest son Yoshikiyo.
元暦元年（1184年）7月の三日平氏の乱(平安時代)において、末子の佐々木義清と共に反乱鎮圧に赴いた。