Emperor Taizong of the Liao Dynasty

Emperor Taizong of Liao, personal name Yaogu, sinicised name Yelü Deguang, courtesy name Dejin, was the second emperor of the Khitan-led Liao dynasty of China.

The Liao dynasty, also known as the Khitan State, officially the Great Liao, was a Khitan-led imperial dynasty of China and empire ruled by the Yelü clan that existed between 916 and 1125. Founded around the time of the collapse of the Tang dynasty, at its greatest extent it ruled over Northeast China, the Mongolian Plateau, the northern part of the Korean Peninsula, southern portions of the Russian Far East, and the northern tip of the North China Plain.