They submitted a petition to the lord of Aizu clan, Katamori MATSUDAIRA who was the Kyoto shugoshoku (Military governor of Kyoto), by which the Aizu clan had the custody of them and they took a name Mibu-Roshigumi (Mibu masterless warriors group).
浪士たちは京都守護職の会津藩主松平容保に嘆願書を提出して、会津藩御預かりとなり壬生浪士組を名乗る。