Zhu Youzhen
In 912, Emperor Taizu was assassinated by his son Zhu Yougui the Prince of Ying, who took the throne. Zhu Yougui made Dai Siyuan the military prefect (團練使, "Tuanlianshi") of Ming Prefecture (洺州, in modern Handan, Hebei). During the subsequent reign of Zhu Yougui's younger brother Zhu Youzhen (who overthrew Zhu Yougui and took over the throne), Dai was made the acting military governor of Baoyi Circuit (保義, headquartered in modern Xingtai, Hebei). In 913, he was made full military governor of Baoyi.