定军山
Xiahou Yuan () (died 219), courtesy name Miaocai, was a Chinese military general and politician serving under the warlord Cao Cao in the late Eastern Han dynasty of China. He is known for his exploits in western China (in parts of present-day Gansu, Ningxia and Shaanxi provinces) in the 210s, during which he defeated Cao Cao's rivals Ma Chao and Han Sui in Liang Province and the surrounding areas, and forced several Di and Qiang tribal peoples into submission. He was killed in action at the Battle of Mount Dingjun while defending Hanzhong Commandery from attacks by a rival warlord Liu Bei. Xiahou Yuan's death was highly dramatised in the 14th-century historical novel "Romance of the Three Kingdoms", in which he was slain by Liu Bei's general Huang Zhong during a surprise raid.