According to the Hachisuka family materials and the materials of Kaoru GOKON, the enthronement was on June 15 (in old lunar calendar) (August 3 in new calendar) and era name has been already changed to 'Taisei' in April, whereas according to the materials of Yosai KIKUCHI, era name was changed to 'Taisei' on June 16 in old lunar calendar.
「大政」は蜂須賀家資料と郷右近馨氏資料には即位は六月十五日（8月3日）とある部分でこの時すでに「大政」と改元されているかのように読めるが、菊池容斎資料では六月十六日に「大政」と改元したとある。