His father is unknown but an existing family tree implies that he was from a family of the Taira clan in Shimousa province and there is a view that he was in the family line of the Kaidou Taira clan (the Iwaki clan).
父は不明だが、下総国の平氏の一族とする系図があり、海道平氏、岩城氏と繋がる家系であったとする意見がある。