Prince of Dai
In 201BC, King Xin of Han—who had been removed by the emperor from his native land to rule over the northern border from Mayi—defected to the Xiongnu. Liu Xi was named King or Prince of Dai in his place. This territory spread over the three northern commanderies of Dai, Yanmen, and Yunzhong and formed the front line between the Han state and the nomads of the Eurasian steppe. Liu Xi fled to Luoyang by himself before a Xiongnu attack in the 12th month of the 7th year of Liu Bang's reign (200BC).