He closely served FUJIWARA no Yorinaga, since his elder sister as well as his little sister became Yorinaga's wives, and when the Hogen Disturbance broke out in 1156, he took part on the side of Emperor Sutoku with Yorinaga (at that time, he was at the post of Sakon no gon no shosho).
姉妹が妻となっていた藤原頼長に近侍し、保元元年(1156年)における保元の乱の際には、頼長とともに崇徳天皇方に参加する（当時成雅は左近権少将の職にあった）。