The ancestor of his family is TAIRA no Yoshifumi who was Kanmu-Heishi (Taira clan); and the family line was the Miura clan, one of the Bando Hachi Heishi (the Eight Taira clans of the East).
家系は桓武平氏の平良文を祖とする坂東八平氏のひとつ三浦氏。