After the Choshu Domain was driven out of Kyoto in the Coup of August 18 for which the Aizu Domain and the Satsuma Domain worked together and fell from power in the Kinmon Incident, he became sanyo (councilor) (Council).
会津藩と薩摩藩が協力した八月十八日の政変で長州藩が追放され、禁門の変で長州が失脚すると参預となる（→参預会議）。