Murong Fuyun
Later in 618, Li Yuan had Yang You yield the throne to him, establishing Tang Dynasty as its Emperor Gaozu. As he was fighting over the supremacy of China with many other rebel rulers, he made overtures to Murong Fuyun, who had by that point taken back the Sui-seized Tuyuhun lands, asking Murong Fuyun to attack one of his rivals, Li Gui the Emperor of Liang. Murong Fuyun agreed, and requested that Murong Shun be released to him. Emperor Gaozu agreed, and in 619 Murong Shun returned to Tuyuhun. However, the return was not a happy one for Murong Shun, who, as Princess Guanghua's oldest son, expected to be crown prince, but in Murong Shun's long absence, Murong Fuyun had already created another son crown prince. He only created Murong Shun the Prince of Daning, and Murong Shun was not pleased.