Overview
Liu Xi was an official of the Khitan-led Liao dynasty of China, at one point serving as a chancellor.
Background
It is not known when Liu Xi was born, but it is known that he was from Zhuo Prefecture (涿州, in modern Baoding, Hebei). His father Liu Jiyong served as a county magistrate for several counties in Zhuo. In Liu Xi's youth, he was known for his being well-studied in Confucianism in his home territory. At one point, he served as a secretary to the major Jin general Zhou Dewei, before he was captured by Liao.
Career with Liao
After being captured by Liao, Liu Xi was given various offices in dealing with fellow ethnic Han that Liao captured. During the Tianfu era (936-947) of Liao's vassal Later Jin, Liu was made the defender of Yanjing (燕京, in modern Beijing). He was responsible for the imperial examinations three times, and reached the chancellor title of Tong Zhongshu Menxia Pingzhangshi. (According to the Zizhi Tongjian, he also at one point served as Emperor Taizong's chief of staff (Shumishi).)
In 946, Liu accompanied Emperor Taizong on his campaign to destroy Later Jin, whose then-emperor Shi Chonggui was no longer willing to be Liao's vassal. After Emperor Taizong was successful in destroy Later Jin, he declared himself the emperor of China as well, and then proceeded to install a number of Liao generals in various military positions over the former Later Jin realms. As part of his orders, Liu was made the defender of Luoyang. Prior to his arrival at Luoyang, Luoyang had been temporarily under the charge of the Khitan general Yelü Chage, the Xi prince Zhuaila, and the Balhae general Gao Mohan, all of whom viewed the Han with disdain. When the general Zhao Zaili, on the way to the former Later Jin capital Daliang to pay homage to Emperor Taizong, stopped at Luoyang, they, without humility, accept his bows. Zhao, in fear, later committed suicide. When Liu arrived at Luoyang, he ordered Zhuaila to stand in his office hall and rebuked him, "Zhao Zaili was an important Han official. You are but a simple chieftain of the north. How do you dare to be so arrogant toward him?" It was said that after this rebuke was known, the people of Luoyang were somewhat comforted.
From Wikipedia (CC BY-SA 4.0).