Yan, known in historiography as the Western Yan was a dynastic state of China ruled by the Xianbei ethnicity. The dynasty existed during the era of Sixteen Kingdoms, but it is not counted among the 16. It was founded by Murong Hong in 384 in the aftermath of the Former Qin's defeat by the Eastern Jin in the Battle of Fei River, with the stated intent of permitting the Xianbei, whom the Former Qin's emperor Fu Jiān had relocated to Former Qin's capital region after destroying the Former Yan in 370. It initially also was intended to rescue the last Former Yan emperor Murong Wei, until he was executed by Fu Jiān in 385. It was a state that was characterized by extreme political instability and internal fighting, as all seven of its rulers died of unnatural causes. After eviscerating the Former Qin, the people of the state abandoned the Guanzhong region and headed east back toward their homeland, but eventually settled down in modern Shanxi. It was destroyed in 394 as Later Yan's emperor Murong Chui wanted to reunite the people formerly of Yan and conquered it.

The Xianbei were an ancient nomadic people that once resided in the eastern Eurasian steppes in what is today Mongolia, Inner Mongolia, and Northeastern China. The Xianbei were strongly suggested to be a multilingual, multi-ethnic confederation consisting of mainly Mongolic, and, to a minor degree, Tungusic and Turkic peoples. They originated from the Donghu people who splintered into the Wuhuan and Xianbei when they were defeated by the Xiongnu at the end of the third century BC. The Xianbei were largely subordinate to larger nomadic powers and the Han dynasty until they gained prominence in 87 AD by killing the Xiongnu Chanyu Youliu. However unlike the Xiongnu, the Xianbei political structure lacked the organization to pose a concerted challenge to the Chinese for most of their time as a nomadic people.