The person that is the mother of XXX is who?
Yelü Lihu
As the third son of Liao's founding emperor Emperor Taizu (Yelü Abaoji) and his wife Empress Shulü Ping, Yelü Lihu served as crown prince during the reign of his older brother Emperor Taizong (Yelü Deguang), who was their second son, as Empress Shulü wanted him to be emperor after Emperor Taizong.
Empress Shulü Ping