Pei Ju
Pei Ju suggested forming an alliance with khagan's subordinate Sheguy, who had been requesting to marry a Sui princess. Emperor Yang agreed and subsequently, Sheguy attacked khagan, defeating him and forcing him to flee to Gaochang. Emperor Yang then sent Pei to Gaochang to persuade Daman to come to Sui. Khagan refused at first. However, after being threatened that his mother would be killed, he had to agree. He subsequently stayed in China and did not return to his own land. Emperor Yang, pleased with this development, awarded Pei with a sable coat and jewels that Daman offered as tribute.