However, during medieval times when the Imperial court's power declined, not a few Crown Princes ascended to the Imperial throne without the ceremonial Rittaishi due to lack of budget for the Rittaishi no Rei.
なお、中世の朝廷衰微の時代には立太子の礼を行う予算がないために儲君が立太子をされないまま、次期天皇に即位した例も多い。