伏允
By 619, Emperor Yang was dead, killed at Jiangdu (江都, in modern Yangzhou, Jiangsu), and Murong Shun, who had been with Emperor Yang at Jiangdu, had returned to the Sui capital Chang'an, then taken over by one of the generals who had rebelled against Emperor Yang, Li Yuan, who had also since then taken the throne and established a new state of Tang as its Emperor Gaozu, still fighting for supremacy of China with many other rebel rulers. Emperor Gaozu negotiated with Murong Fuyun, who had by now recovered the Tuyuhun lands, to attack one of his rivals, Li Gui the Emperor of Liang. Murong Fuyun agreed, and requested that Murong Shun be released. Emperor Gaozu agreed, and Murong Shun was able to return to Tuyuhun. (However, by this time, Murong Fuyun had already created another son to be his crown prince, and it was said that Murong Shun was depressed thereafter.)