The Liao dynasty, also known as the Khitan Empire, officially the Great Liao, was an imperial dynasty of China that existed between 916 and 1125, ruled by the Yelü clan of the Khitan people. 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.