among his activities the thing that was especially conspicuous was that he helped yoshitomo with his strong support when yoshitomo tried to establish hegemony over the sagami province; it is said that yoshiaki supported minamoto no yoshihira , the son of yoshitomo , logistically when yoshihira fought with his uncle minamoto no yoshikata in the battle of okura in 1155 (according to a theory , the mother of yoshihira was the daughter of yoshiaki ). 殊に相模国における義朝の覇権確立の有力な後ろ盾となり、久寿2年（1155年）に義朝の子・源義平が叔父の源義賢と戦った大蔵合戦では、後方からこれを支援したとされる（一説によると義平の母は義明の娘とも言われる）。
among his activities the thing that was especially conspicuous was that he helped yoshitomo with his strong support when yoshitomo tried to establish hegemony over the sagami province; it is said that yoshiaki supported minamoto no yoshihira , the son of yoshitomo , logistically when yoshihira fought with his uncle minamoto no yoshikata in the battle of okura in 1155 (according to a theory , the mother of yoshihira was the daughter of yoshiaki ). 殊に相模国における義朝の覇権確立の有力な後ろ盾となり、久寿2年（1155年）に義朝の子・源義平が叔父の源義賢と戦った大蔵合戦では、後方からこれを支援したとされる（一説によると義平の母は義明の娘とも言われる）。
