# Jin dynasty (266–420)

Jin dynasty map The Jin dynasty was an imperial family that has ruled China from 265-420 AD. It was founded by Sima Yan, who later became known as Emperor Wu of Jin. Sima Yan was the regent of the Cao Wei dynasty, which existed during the Three Kingdoms period. A regent is a person that is appointed to rule on the behalf of the emperor. This happens when an emperor is unable to rule due to being too young, very sick, or absent.

The Jin dynasty's history was divided into two parts: Eastern Jin and Western Jin. The Western Jin (265-317 AD). formed after Emperor Wu (Sima Yan) took the throne from Cao Huan, the Cao Wei dynasty's last emperor. The first capital of Western Jin was Luoyang, then it became Chang'an (it's new name is Xi'an). In 280 AD, the Western Jin conquered the Eastern Wu state, finally ending the Three Kingdoms period, and reuniting China for the first time after the Han dynasty.

From 291 to 306 AD, a series of civil wars called the War of the Eight Princes were fought between the princes of the Jin dynasty to control the empire. This made the empire very weak. In 304 AD, the non-Han people in China launched rebellions, and these non-Han people were called the Five Barbarians.

The barbarians created states in the north of China, which caused the Sixteen Kingdoms era to start in Chinese history. These states fought each other and the Jin dynasty. Han-Zhao, one of the states created, captured Luoyang in 311, and captured Chang'an 316, and killed Emperor Min of Jin, ending the Western Jin era. Sima Rui, who came after Emperor Min, then recreated the Jin dynasty with its capital in Jiankang (its new name is Nanjing), starting the **Eastern Jin** era (317–420 AD).

The Eastern Jin dynasty was in constant problems with the northern states for most of its existence, and it launched several invasions of the north to take back its lost territories. In 383 AD, the Eastern Jin defeated the Former Qin, a Di-ruled state that had shortly unified northern China. After that battle, the Former Qin state collapsed, and Jin armies recaptured the lands south of the Yellow River. The Eastern Jin was eventually overthrown by General Liu Yu in 420 CE and replaced with the Liu Song dynasty. The Eastern Jin dynasty is considered the second of the Six Dynasties, which were six dynasties ruled by the Han people from the 3rd century to the 6th century.

## History

Sima Yi
During the Three Kingdoms period, the Sima family, along with it's most important individual Sima Yi became famous in the Cao Wei kingdom. The Cao Wei kingdom was located in northern China. Sima Yi was the regent of the Cao Wei dynasty, and in 249 AD, he tried to take the thrown in an incident known as Incident at the Gaoping Tombs. The Sima clan began to become more important and powerful than the ruling Cao Wei dynasty.

After Sima Yi died in 251, Sima Yi's oldest son Sima Shi succeeded his father as regent of Cao Wei, maintaining the Sima clan's important role on the Cao Wei political scene. After Sima Shi died in 255, Sima Shi's younger brother Sima Zhao became the regent of Cao Wei. Sima Zhao further assisted his clans' interests by ending rebellions and dissent.

In 263, he made the Cao Wei forces conquer Shu Han and capture Liu Shan (the son of Liu Bei), marking the first fall of one of the Three Kingdoms. Sima Zhao's actions awarded him the title of King of Jin, the last achievable rank under the emperor. He was granted the title because his home was located in Wen County, on the territory of the Zhou-era state of Jin, which was centered on the Jin River in Shaanxi. Sima Zhao really wanted to take the throne, but he died in 265 before he could take it, passing the opportunity to his ambitious son Sima Yan.

### Western Jin (265–316)

#### Founding and unification

The Western Jin was found by Sima Yan, who became known as Emperor Wu of Jin (The Martial Emperor of Jin). After succeeding his father as the King of Jin and regent of Cao Wei in 265, Sima Yan declared himself emperor of the Jin dynasty on 4 February 266 and forced the final Cao Wei emperor Cao Huan to abdicate. Emperor Wu allowed Cao Huan to live the rest of his life with honour as the Prince of Chenliu, and he was later buried with imperial ceremony. In 280, Emperor Wu conquered the Eastern Wu and united China, ending the Three Kingdoms period.

Emperor Hui, or Sima Zhong
Following the unification, China entered a decade of peace and economic prosperity, with accounts detailing the expensive and bizarre lifestyles of the ruling class. Internally, Emperor Wu upheld Confucian inheritance by making that his eldest son, Sima Zhong, later known as Emperor Hui, would succeed him to the throne, despite his developmental disability. To protect his heir and dynasty, he made his princes and dukes powerful by appointing them to important military and administrative positions. Meanwhile, a few officials also began expressing concerns regarding the growing population and treatment of the various non-Han peoples ("Five Barbarians") that had been living in northern China for centuries.

### **Decline**

Emperor Wu died in 290, and Emperor Hui's ascension began the War of the Eight Princes. In 291, Emperor Hui's wife, Empress Jia, took power and began ruling the empire behind her husband's throne. Under her rule, the wealth of the ruling class went unchecked, and corruption was very widespread in the government. She and her family were overthrown in 300, but a series of civil wars soon broke out between the Sima princes for the regency and succession of Emperor Hui, devastating most of northern China and the imperial military.

Liu Cong in a painting from the Tang dynasty
The short unification of China came to an end in 304; that year, the Cheng-Han and Han-Zhao states declared their independence from Jin. The Upheaval of the Five Barbarians carried on the chaos from the War of the Eight Princes, as uprisings and famines continued to weaken Jin authority in the north. In 311, the Jin capital Luoyang was attacked by Han-Zhao forces under Liu Cong, and Sima Chi, known as Emperor Huai, was captured and later killed. Emperor Huai's successor Sima Ye, known as Emperor Min, was then also captured and killed by Han-Zhao when they captured Chang'an (present-day Xi'an) in 316, marking the end of the Western Jin era. The surviving members of the Jin imperial family, as well as large numbers of Han Chinese from the North China Plain, fled to southern China. These refugees had a large impact on the lands they moved to—for example, they gave Quanzhou's Jin River its name upon their settlement there.

### Eastern Jin (317-420 AD)

Emperor Yuan (Sima Rui)
After the fall of Chang'an and the killing of Emperor Min of Jin, Sima Rui, later known as Emperor Yuan, became Jin emperor in 318. He recreated the Jin government at Jiankang (its new name Nanjing), which became the dynasty's new capital and marked the beginning of the Eastern Jin period. Since one of Sima Rui's titles was the prince of Langya, the newly created northern states, denied the legitimacy of his succession, sometimes referred to his empire as "Langya".

The Eastern Jin period saw the peak of *menfa* (門閥 'gentry clan') politics. The authority of the emperors was weakend, while empire's affairs were controlled by powerful immigrant elite families like the Wang (王) clans of Langya and Taiyuan, the Xie (謝) clan of Chenliu, the Huan (桓) clan of Qiao Commandery, and the Yu (庾) clan of Yingchuan. Among the people, a common remark was that "Wang Dao and Sima Rui, they dominate the nation together" (王與馬，共天下). It was said that when Emperor Yuan was holding court, he even invited Wang Dao to sit by his side so they could jointly accept congratulations from ministers, but Wang Dao declined the offer.

#### Wars with the north

Huan Wen
Expeditions of Huan Wen
In order to take back the lands lost during the fall of the Western Jin, the Eastern Jin dynasty launched several military campaigns against the northern states, such as the expeditions led by Huan Wen from 354 to 369. In 383, a heavily outnumbered Eastern Jin force devastatingly defeated the state of Former Qin at the Battle of Fei River. After this battle, the Former Qin—which had recently unified northern China—began to collapse, and the Jin dynasty recovered the lands south of the Yellow River. Some of these lands were later lost, but the Jin regained them once more when Liu Yu defeated the northern states in his northern expeditions of 409–416.

Despite successes against the northern states like the Battle of Fei River, paranoia in the royal family and disruptions often caused loss of support for northern campaigns. For example, lack of support by the Jin court was a major cause of Huan Wen's failure to recover the north in his expeditions. Additionally, internal military crises—including the rebellions of generals Wang Dun and Su Jun, plagued the Eastern Jin throughout its 104-year existence.

### **Fall of the Jin dynasty**

Liu Yu
In 403, Huan Xuan, the son of general Huan Wen, took the throne the from the Jin dynasty and declared the dynasty of Huan Chu. Huan Xuan was soon removed by Liu Yu, who brought back Jin rule by putting Sima Dezong on the throne, later known as Emperor An. Meanwhile, the civilian administration suffered, as there were more revolts led by Sun En and Lu Xun, and Western Shu became an independent kingdom under Qiao Zong. In 419, Liu Yu had Sima Dezong strangled and replaced by his brother Sima Dewen, later known as Emperor Gong. Finally, in 420, Sima Dewen abdicated in favour of Liu Yu, who declared himself the ruler of the new Song dynasty (which is referred to as the Liu Song dynasty by historians in order to prevent confusion with the Song dynasty established in 960 AD). Sima Dewen was then asphyxiated with a blanket in the following year. In the north, Northern Liang, the last of the Sixteen Kingdoms, was conquered by Northern Wei in 439, starting in the Northern dynasties period.