Niu Xianke (牛仙客) (675 – September 2, 742), formally Duke Zhenjian of Bin (豳貞簡公), was a general and official of the Chinese dynasty Tang Dynasty, serving as a chancellor during the reign of Emperor Xuanzong. He took an unconventional rise to the chancellor position—by starting as a low-level bureaucrat and gradually getting promoted, rather than going through the imperial examinations -- and was known for being careful and obedient to fellow chancellor Li Linfu.
Read more about Niu Xianke: Background, During Emperor Xuanzong's Reign