In a military epic 'Kohokuki,' its name appears as one of the 12 clans of konpon hikan (primal vassals), in which such clans as the Imai, the Kawake, the Akao, the Anyoji and the Mitamura were also included.
「江北記」には根本被官として今井、河毛、赤尾、安養寺、三田村氏ら12氏のうちの一つとして列記されている。