Yelü Bei
China was in chaos after the fall of the Tang dynasty in 907. Known as the Wudai Shiguo period, Five Dynasties ruled northern China in rapid succession with only nominal support from the Ten Kingdoms of southern China. The Tang dynasty had been supported by Shatuo Turks until Zhu Wen murdered the last Tang emperor and founded the Later Liang dynasty. The Shatuo Turks, who had been allied with the Khitans since 905, defeated the Later Liang and founded the Later Tang dynasty in 923, but by 926 the former allies had grown apart. In 934 Yelü Bei, Abaoji's son, wrote to his brother Emperor Taizong of Liao from the Later Tang court: "Li Cong Ke has slain his liege-lord, why not attack him?" In 936, the Khitans supported Shi Jing Tangs rebellion against the Later Tang Emperor Li Cong Ke. Shi Jing Tang became emperor of the Later Jin dynasty and, in exchange for their support, the Khitans gained sixteen new prefectures.