There is a theory that he was the fourth-generation descendant of Imperial Prince Iyo, the third prince of Emperor Kanmu, but this theory lacks credibility because it is based on a family tree made during the Meiji period.
桓武天皇の第3皇子伊予親王の四世子孫という説があるが、明治時代に作られた系図によるもので信用できない。