China, a History

The first of the two periods, the Western Jìn Dynasty (ch: 西晉, 265–316), was founded by Emperor Wu, better known as Sima Yan. Although providing a brief period of unity after conquering the Kingdom of Wu in AD 280, the Jìn could not contain the invasion and uprising of nomadic peoples after the devastating War of the Eight Princes. The capital was Luoyang until 311 when Emperor Huai was captured by the forces of Han Zhao. Successive reign of Emperor Min lasted four years in Chang'an until its conquest by Han Zhao in 316.

Meanwhile remnants of the Jìn court fled from the north to the south and reestablished the Jìn court at Jiankang, south-east of Luoyang and Chang'an and near modern-day Nanjing, under Prince of Longya. Prominent local families of Zhu, Gan, Lu, Gu and Zhou supported the proclamation of Prince of Langye as Emperor Yuan of the Eastern Jìn Dynasty (ch: 東晉 317–420) when the news of the fall of Chang'an reached the south. (Because the emperors of the Eastern Jìn Dynasty came from the Langye line, the rival Wu Hu states which did not recognize its legitimacy would at times refer to Jìn as "Langye.")

Militaristic authorities and crises plagued the Eastern Jìn court throughout its 104 years of existence. It survived the rebellions of Wang Dun and Su Jun. Huan Wen died in 373 before he could usurp the throne (which he had intended to do). Battle of Fei turned out to be a victory of Jìn under a short-lived cooperation of Huan Chong, brother of Huan Wen and the Prime Minister (or Imperial Secretariat) Xie An. Huan Xuan, son of Huan Wen, usurped and changed the name of the dynasty to Chu. He was toppled by Liu Yu, who ordered the strangulation of the reinstated but retarded Emperor An. The last emperor and brother of Emperor An, Emperor Gong, was installed in 419. Abdication of Emperor Gong in 420 in favor of Liu Yu, then Emperor Wu, ushered in the Liu Song Dynasty and the Southern Dynasties.

Meanwhile North China was ruled by the Sixteen Kingdoms, many of which were founded by the Wu Hu, the non-Han Chinese ethnicities. The conquest of the Northern Liang by the Northern Wei Dynasty in 439 ushered in the Northern Dynasties.