In 420, the general Liu Yu forced the last Eastern Jin emperor to abdicate and proclaimed a new southern dynasty, Liu Song, based at Jiankang (modern Nanjing). Historians often treat this political break as the start of the Northern and Southern Dynasties era, when rival courts ruled the north and south in parallel.
In 439, Northern Wei defeated remaining rival states and unified most of northern China, ending the earlier era of many competing northern kingdoms. This created a more stable northern rival to the southern dynasties and set the basic north–south political divide for much of the period.
In 479, Liu Song ended when its last ruler was forced out and the Southern Qi dynasty took power at Jiankang. This change shows a pattern in the south: court politics and elite rivalries often caused dynastic turnover even when the capital and governing system stayed similar.
In 485, Northern Wei introduced the equal-field system, a state-managed way to assign farmland and collect taxes. The reform aimed to limit the growth of powerful landed families and to stabilize government revenue by tying land, households, and obligations more closely to the state. Later dynasties built on these ideas when rebuilding a unified empire.
In 493, Northern Wei shifted its capital to Luoyang, an older center of Chinese imperial administration. The move supported major cultural and administrative changes meant to strengthen rule over a largely Han Chinese population, but it also increased tensions between the court and military communities on the northern frontier.
In 502, Xiao Yan seized power and founded the Liang dynasty, beginning one of the longer and more stable southern reigns of the era. Liang became known for strong imperial patronage of Buddhism and for maintaining a sophisticated court culture, even as military pressures from the north continued.
In 523, soldiers and residents in Northern Wei’s frontier garrisons rose in revolt, fueled by hardship and resentment against officials. The long-running unrest weakened Northern Wei’s control over the north and helped shift real power toward competing military commanders.
In 534, Northern Wei effectively broke apart when rival power blocs backed different emperors and courts, forming Eastern Wei in the east and (soon after) Western Wei in the west. The split ended the earlier period of a single dominant northern state and opened a new phase of north–north warfare as well as north–south rivalry.
In 537, Western Wei forces under Yuwen Tai defeated a much larger Eastern Wei army at Shayuan (in today’s Shaanxi). The victory helped secure Western Wei’s hold on the Guanzhong region around Chang’an and prevented Eastern Wei from quickly reunifying the north.
In 549, the rebel general Hou Jing captured Jiankang, the Liang capital, after a major civil war. The crisis shattered Liang’s authority, disrupted administration and the economy, and made southern politics even more vulnerable to military strongmen.
In 550, Gao Yang deposed the Eastern Wei emperor and founded the Northern Qi dynasty. Northern Qi controlled the richer northeastern plains, becoming a major northern power and a key rival to the western regime that would become Northern Zhou.
In 557, Western Wei ended and Northern Zhou began in the northwest, while in the south the Chen dynasty replaced the weakened Liang. These near-simultaneous changes narrowed the contest to a smaller number of stronger states, setting up the final struggle that would end the long division.
In 577, Northern Zhou defeated Northern Qi and absorbed its territory, bringing most of northern China under one ruler again. With the north unified, the main remaining barrier to reunification was the Chen dynasty across the Yangtze River in the south.
On March 4, 581, the northern general and court official Yang Jian seized the throne and founded the Sui dynasty. Sui inherited a newly unified north and built a stronger central government, positioning it to complete reunification by conquering the remaining southern state.
In 589, Sui forces captured Jiankang and eliminated the Chen dynasty, the last southern court. This conquest reunited China under one dynasty after centuries of division, marking the close of the Northern and Southern Dynasties era and setting the stage for the larger imperial systems of the Sui and Tang.
Northern and Southern Dynasties (420–589 CE)