According to several theories, his origins include a branch line of the Yamazaki clan in Sasaki family of Omi-Genji (Minamoto clan), the Yoshifumi line of the Kanmu-Heishi (Taira clan), a line of the Fujiwara clan or a line of the Tachibana clan, it is, however, unknown to be precise.
近江源氏佐々木氏の族山崎氏の余流、桓武平氏良文流、藤原氏流、橘氏流とする説があるが、正確には不明である｡