Nurse empress dowager
Nurse empress dowager (Chinese: 保太后; pinyin: Bǎo Tàihòu) was an honorific title given to emperors' wet nurses of the Xianbei-led Chinese Northern Wei dynasty. The existence of the title owed itself to a peculiar institution of Northern Wei—that when a son of the emperor were to be made crown prince, his mother, if alive, must be forced to commit suicide.