石敬瑭
In 936 Shi Jingtang secured an alliance with the Yelü Deguang to overthrow his brother-in-law Li Congke of the Later Tang with Khitan forces. He ceded the Sixteen Prefectures, promised annual tribute, and accepted a subordinate role to Yelü Deguang. In return the Khitan ruler appointed Shi Jingtang as Emperor of the Later Jin. Throughout his reign Shi Jingtang maintained amicable relations with his overlord, despite criticism from many officials.