He served the Daikakuji-to (the imperial lineage starting with Emperor Kameyama), and acted as Hokumen no bushi (Imperial Palace Guards for the North Side) under Emperor Gouda, who treated Tadamori preferentially, since Tadamori's rank was still a doctor at that time.
大覚寺統に仕え、後宇多天皇の元で医師の身分のまま、北面武士を務めて重用された。