The Emperor's side, to which Kiyomori belonged, won the Hogen War, and in January of 1157 Shigemori at the age of 19 was promoted to the Jugoinojo (Junior Fifth Rank, Upper Grade) rank for his outstanding performance.
保元の乱は清盛の属す天皇方の勝利に終わり、保元2年（1157年）正月、重盛はその功績により19歳で従五位上に昇叙した。