Grand empress dowager
Grand empress dowager (also grand dowager empress or grand empress mother) (Chinese and Japanese: 太皇太后; pinyin: tàihuángtàihòu; rōmaji: taikōtaigō; Korean: 태황태후 (太皇太后); romaja: Tae Hwang Tae Hu; Vietnamese: Thái Hoàng thái hậu (太皇太后) was a title given to the grandmother, or a woman from the same generation, of a Chinese, Japanese, Korean, or Vietnamese emperor in the Chinese cultural sphere. Some grand empresses dowager held regency during the emperor's childhood.