In historical materials including 'Kofuku-ji Engi' (origin of Kofuku-ji Temple), 'Okagami' (The Great Mirror), 'Kugyobunin' (directory of court nobles) and 'Sonpi Bunmyaku' (Bloodlines of Noble and Base), Fuhito was referred to as an 'illegitimate child' of the Emperor Tenchi.
「興福寺縁起」、「大鏡」、「公卿補任」、「尊卑分脈」などの史料では天智天皇の「御落胤」と書かれる。