耶律大石
During the reign of Emperor Tianzuo of Liao, the Jurchen chieftain Wanyan Aguda rebelled against the rule of the Liao dynasty. In 1115, the Jin dynasty was officially proclaimed with Wanyan Aguda as its first emperor. In 1122, Emperor Tianzuo fled to Jiashan (north of modern-day Tumed Left Banner, Inner Mongolia) under the military pressure from the Jin dynasty. Subsequently, Yelü Chun was enthroned as "Emperor Tianxi" () by Yelü Dashi and Huilibao. The Emperor Tianzuo, on the other hand, was demoted to a prince and given the title "Prince of Xiangyin" by the Northern Liao court. As the Liao dynasty ruled by Emperor Tianzuo still existed, the regime headed by Emperor Tianxi is known in retrospect as "Northern Liao" ().