Jane said the Eastern Jin Dynasty.
Wen Wen. 
The Eastern Jin Dynasty (317-420) was a dynasty in Chinese history that was established in the south by Sima Rui, the evil king of Lang, after the fall of the Western Jin Dynasty. During the Eastern Jin Dynasty, China's economic development reached its peak, and great achievements were made in culture and art.
The Eastern Jin Dynasty regime maintained a long-term rule of partial peace, and the politics of the gate lord was its distinctive feature. The decline of imperial power and the control of the government by the high-ranking clans seriously hindered the progress of society. Although assisted by famous generals such as Tao Kan, Yu Liang, Huan Wen, and Xie An, the fate of the Eastern Jin Dynasty did not change.
In 385 AD, Xie An fell ill and died, and Emperor Xiaowu of Jin handed over power to his younger brother Sima Daozi. Sima Daozi and his son Sima Yuanxian controlled the government, and they were tyrannical and incompetent, and exploited the people on a large scale. In 398 AD, the allied forces of Wang Gong, Yin Zhongkan, Lu Kai and others with Huan Xuan as the leader occupied the prefectures and counties west of Jiankang, so that the rule of the imperial court was limited to the eight counties in the east, and the process of its decline began.
In the third year of Andi Long'an (399), Sun En, who believed in the Wudoumi religion, took advantage of the people's commotion and started an incident in the east. They grew to hundreds of thousands in just a few days, and were later defeated by the Jin generals Xie Yan and Liu Gaozhi and fled to the island. In 402 AD, Sun En was completely wiped out. This uprising greatly weakened the power of the Jin Dynasty, and Huan Xuan took this opportunity to send troops to capture Jiankang, depose Emperor An of Jin, and establish himself as emperor.
In general, the Eastern Jin Dynasty was an important dynasty in Chinese history, and although it was in a small corner, it made important contributions to China's economic development and cultural prosperity. At the same time, it also provides us with a profound lesson about gatekeeper politics and social unrest.