In 1867 in the late Edo period, the Edo bakufu ruined due to the Taisei Hokan conducted by the 15th Seii Taishogun, Yoshinobu TOKUGAWA, then through the mediation of Tetsutaro YAMAOKA, the bloodless surrender of Edo Castle was decided at a meeting of Takamori SAIGO, a general officer of the grand government general, and Kaishu KATSU, president of the Tokugawa family's army.
江戸時代後期、慶応3年（1867年）に15代征夷大将軍徳川慶喜が大政奉還を行って江戸幕府が消滅し、山岡鉄太郎の斡旋により新政府軍の大総督府参謀である西郷隆盛と徳川家陸軍総裁の勝海舟の会談で江戸城の無血開城が決定する。