It was Kaishu KATSU and the former Prince Taruhito's fiancee, Seikan in no Miya (Kazunomiya), who contributed to the opening of the Edo castle without any fighting.
この無血開城に勝海舟と共に尽力したのが、熾仁親王のかつての婚約者、静寛院宮（和宮）であった。