Zhao Yun, courtesy name Zilong (子龍), was a military general who lived during the late Eastern Han dynasty and early Three Kingdoms period of China. Originally a subordinate of the northern warlord Gongsun Zan, Zhao Yun later came to serve another warlord, Liu Bei, and had since accompanied him on most of his military exploits, from the Battle of Changban (208) to the Hanzhong Campaign (217–219). He continued serving in the state of Shu Han – founded by Liu Bei in 221 – in the Three Kingdoms period and participated in the first of the Northern Expeditions until his death in 229. While many facts about Zhao Yun's life remain unclear due to limited information in historical sources, some aspects and activities in his life have been dramatised or exaggerated in folklore and fiction. In the 14th-century historical novel Romance of the Three Kingdoms, he was lauded as a member of the Five Tiger Generals under Liu Bei.

The Three Kingdoms of Cao Wei, Shu Han, and Eastern Wu dominated China from 220 to 280 AD following the end of the Han dynasty. This period was preceded by the Eastern Han dynasty and followed by the Western Jin dynasty. Academically, the periodisation begins with the establishment of Cao Wei in 220 and ends with the conquest of Wu by Jin in 280. The period immediately preceding the Three Kingdoms from 184 to 220 was marked by chaotic infighting among warlords across China as Han authority collapsed. The period from 220 to 263 was marked by a comparatively stable arrangement between Cao Wei, Shu Han, and Eastern Wu. This stability broke down with the conquest of Shu by Wei in 263, followed by the usurpation of Cao Wei by Jin in 266, and ultimately the conquest of Wu by Jin in 280.