 However, Yang Zhao, who became crown prince, died in 606, and Yang Jian lost Emperor Yang's favor in 608 over his use of witchcraft against Yang Zhao's sons.Empress Xiao often accompanied Emperor Yang on his tours around the empire, and she saw that he had lost his virtues.She wrote a circumspect poem to try to get Emperor Yang to change his ways, but he either did not realize that was her intent, or simply ignored the poem.