In 3 17, Si Marui, the royal family, was called the King of Jin in Jiankang (he became emperor in 3 18). He was the emperor of Jin and Yuan Dynasties and was known as the Eastern Jin Dynasty in history. The Eastern Jin Dynasty itself did not have strong strength, mainly relying on the natural barrier of the Yangtze River to settle in the south of the Yangtze River; Wang Dao, the prime minister, called on the gentry of the Central Plains to take refuge in the south, united with the clans in the south and gained their support. However, frequent conflicts and civil strife between the northern and southern clans led to the instability of the Eastern Jin regime.
After the demise of the Western Jin Dynasty, the southern Xiongnu, Jie Li, Bai Nu, Dingling, Tiefu, Lushui Tiger, Tuoba Xianbei, Yuwen Xianbei, Duan Xianbei, Murong Xianbei, Bald Xianbei, Qi Xianbei, Jiushihu, Da Yue, Heba, Jiang, Fuxi.
Editor: People who moved from the north to the south in the Northern Expedition often missed their hometown, so some people with lofty ideals made many northern expeditions in the hope of recovering the northern territory. Zu Ti was a general who led the Northern Expedition in the Eastern Jin Dynasty. He once led an army to recover the area south of the Yellow River. However, due to internal disputes in the Eastern Jin Dynasty, the court was worried that his prestige was too high after the success of the Northern Expedition, and as a result, he did not give support and led to failure. Zu Ti died of grief and indignation, and the recovered land was reoccupied by the Hu people.
After Zu Ti, Huan Wen made three northern expeditions and once recovered Luoyang. He repeatedly asked the court to move the capital back to Luoyang, but was opposed by the big family. The official minister of the Eastern Jin Dynasty was afraid that his power was too great to control, so it could not be realized.
Zu Ti, a southern gentry, led the Northern Expedition and once recovered the Yellow River basin. After that, the ruling gentry flaunted the Northern Expedition to increase their prestige, among which Huan Wen's three northern expeditions were the most famous. Luoyang was recovered, entered the customs and marched into Hebei, but failed to consolidate the achievements of the Northern Expedition. In 383 AD, the former Qin Dynasty went south, and the Eastern Jin Dynasty faced an unprecedented threat. Under the management of Prime Minister Xie An, Xie Shi and Xie Xuan led the northern government soldiers to defeat the former Qin army and won a decisive victory in the battle of Feishui. Since then, due to the elimination of the threat of external chaos, civil war broke out in the south, and Sun En and Lu Xun rose up. Huan Xuan won the civil war and once usurped King. Emperor Wu of song, the general of the northern government, established his prestige by fighting the peasant army through the northern expedition, and finally replaced the Eastern Jin Dynasty.