It is not known when Cui Yuanshi was born. He was from "The elder house of Boling" of the prominent
Cui clan of Boling (博陵, in modern
Hengshui,
Hebei), which claimed ancestry from the ruling Jiang house of the
Spring and Autumn period state
Qi. Cui Xuan's traceable ancestors included officials of the
Qin dynasty,
Han dynasty,
Jin dynasty (266–420),
Northern Wei, and the
Tang dynasty. His father Cui Jing (崔儆) served as a secretary general of the executive bureau of government (尚書省,
Shangshu Sheng). His older brother Cui Yuanlüe (崔元略) was a prominent official during the reigns of
Emperor Xianzong, Emperor Xianzong's son
Emperor Muzong, and Emperor Muzong's sons
Emperor Jingzong and
Emperor Wenzong. Cui Yuanlüe was considered a potential
chancellor at times but was never chancellor. Cui Yuanlüe's son
Cui Xuan, however, served as a chancellor before Cui Yuanshi did, and would again after Cui Yuanshi. Other than Cui Yuanlüe, Cui Yuanshi also had at least one older brother, Cui Yuanshou (崔元受), and one younger brother, Cui Yuanru (崔元儒); all of these Cui brothers known in history, including Cui Yuanshi passed the
imperial examinations in the
Jinshi class. Cui Yuanshi himself served on the staffs of regional governors early in his career. He was eventually himself made the governor (觀察使,
Guanchashi) of Hunan Circuit (湖南, headquartered in modern
Changsha,
Hunan). == During Emperor Wuzong's reign ==