The Jin dynasty or the Jin Empire, sometimes distinguished as the Sima Jin (司馬晉) or the Two Jins (兩晉), was an imperial dynasty in China that existed from 266 to 420. It was founded by Sima Yan, eldest son of Sima Zhao, who had previously been declared the King of Jin. There are two main divisions in the history of the dynasty. The Western Jin (266–316) was established as the successor to Cao Wei after Sima Yan usurped the throne from Cao Huan and took the title of Emperor Wu. The capital of the Western Jin was initially in Luoyang, though it later moved to Chang'an. In 280, after conquering Eastern Wu, the Western Jin ended the Three Kingdoms period and reunited China proper for the first time since the end of the Han dynasty.

The Upheaval of the Five Barbarians also translated as the Uprising, Rebellion or the Revolt of the Five Barbarians is a Chinese expression used to refer to a chaotic period of warfare during the Jin dynasty (266–420) roughly between 304 and 316 which heavily involved non-Han peoples living in China, commonly called the Five Barbarians. Coinciding with the War of the Eight Princes that greatly weakened the empire, these conflicts eventually drove the Jin imperial court out of northern and southwestern China.