It was the first time in about 320 years that someone other than emperors' consorts or real mothers received senge for Nyoingo after Yasuko HINO (Kitayamain), who was the lawful wife of Yoshimitsu ASHIKAGA, the third Shogun of the Muromachi bakufu (Japanese feudal government headed by a shogun), the Imperial Princess Takako has been the last case up to today.
天皇の后妃、生母以外での女院号宣下は室町幕府3代将軍足利義満の正室、日野康子（北山院）以来約320年ぶりで、現在に至るまで孝子内親王が最後の例である。