In 201 BC, 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.
[2] Liu Xi was named King or Prince of Dai in his place.
[2] 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.
[4] Following this display of cowardice, Liu Xi was replaced in Dai and demoted to Marquess of Heyang (t 合陽, s 合阳, Héyáng),[3][5] a county southeast of present-day Heyang County.
Liu Xi died in 193 BC and was subsequently honored under the posthumous name of the "Qing" or "Momentary King".