窦建德
Yuwen Huaji (; died 619) was a general of the Chinese Sui Dynasty who, in 618, led a coup against and murdered Emperor Yang of Sui. He subsequently declared Emperor Yang's nephew Yang Hao emperor and led Emperor Yang's elite Xiaoguo Army (驍果) north. However, he was then repeatedly defeated by Li Mi, Li Shentong (李神通), and finally Dou Jiande. Believing that his defeat was near and wanting to become emperor before his ultimate defeat, he poisoned Yang Hao and declared himself the emperor of a Xu state. Dou captured him in 619 and killed him.