Emperor Ai of Tang
In 904, Zhu forced Emperor Zhaozong to move the capital from Chang'an to Luoyang, which was even more firmly under his control. Later that year, fearing that the adult Emperor Zhaozong would try to rise against him while he was away on campaigns against other warlords, he had Emperor Zhaozong assassinated. Bypassing Li Yu and the other older princes, he had an edict issued in Emperor Zhaozong's name creating Li Zuo crown prince and changing his name to Li Chu. Shortly after, Li Chu took the throne (as Emperor Ai). Empress He, who survived the assassination, was honored empress dowager.
Conquest of the Western Turks
The empire of the Tang Dynasty (June 18, 618 – June 1, 907), successor of the Sui Dynasty, was a cosmopolitan hegemon that ruled one of China's most expansive empires. Raids by the nomadic Khitans and Turks challenged Tang rule, and Tang rulers responded by pursuing strategies of divide and conquer, proxy warfare, tributes, and marriages.