He is considered to have been one of powerful close associates of Masakado, based on the fact that he later issued, with Prince Okiyo, their original appointment order under Masakado, appointing himself as Assistant Governor of Hitachi Province.
後に将門の許で興世王と共に独自に除目を発令し、自らは常陸介に任命されている事から将門の側近の実力者の一人であったと考えられている。