An Imperial prince who had been designated as Chokun conventionally performed Rittaishi no Rei (ceremonial investiture of the Crown Prince) to declare both domestically and internationally that he became Crown Prince who was the heir to the Imperial throne.
儲君を受けた皇子は立太子の礼（立太子礼）の儀式を執り行い、内外に皇嗣たる皇太子に就任したことを宣言する習わしであった。