In 1603, when Ieyasu took charge of the extended Minamoto family/became seii taishogun (literally, "great general who subdues the barbarians") he became part of the 'Seiwa-Genji' (Minamoto clan).
慶長8年（1603年）に家康が源氏長者・征夷大将軍に任ぜられるときには、「清和源氏」となっていた。