His natural father, Yasushige HONGO was a member of Murakami-Genji (Minamoto clan) and lived in Hongo, Oi-gun, Wakasa Province, where his family has been around for generations as the birthplace of clan.
実父の本郷泰茂は村上源氏の一族で、若狭国大飯郡本郷を本貫地として代々住んでいた。