His father was regarded as TAIRA no Sukemori, who was a descendant of TAIRA no Korehira, Kanmu Heishi (Taira clan), and his mother was a concubine of Sukemori (not to be confused with Kenreimonin Ukyo no Daibu, a female waka poet) who was a niece of Shinkai, Ajari (a master in esoteric Buddhism; a high priest) in Ichijobo of Onjo-ji Temple.
父は桓武平氏平維衡の平資盛とされ、母は資盛の側室（女流歌人の建礼門院右京大夫ではない）で、園城寺（園城寺）一条坊の阿闍梨真海の姪。