Having been a retainer of the Ukita clan as well, the Hanabusa clan was taken under Ieyasu TOKUGAWA's protection after an internal issued in the Ukita family, and belonged to the East squad in the Battle of Sekigahara.
花房氏もまた宇喜多氏の家臣であったが、宇喜多家の内紛ののち徳川家康の庇護下に入り、関ヶ原の戦いで東軍についた。