For this reason, when MINAMOTO no Yoritomo took up arms against the Taira clan in August 1180, Michikiyo also took up arms and killed mokudai (deputy) of TAIRA no Koremori of the Taira family to rule over Iyo Province completely.
このため治承4年（1180年）8月に源頼朝が打倒平氏の兵を挙げると、通清も挙兵して平家の平維盛の目代を討ち、伊予を完全に支配圏に置いた。