Michikiyo bore resentment against TAIRA no Kiyomori because Kiyomori had confiscated all his territories but Kono-go district for the reason that he had taken the side of the Minamoto clan in the Heiji War.
平治の乱のとき、源氏側に味方したため、平清盛から河野郷以外の所領を全て没収され、清盛を恨んでいた。