Emperor An of Jin (; 382–419), personal name
Sima Dezong (司馬德宗), was an emperor of the Eastern
Jin Dynasty (265-420) in
China. He was described as so
developmentally disabled that he was unable to speak, clothe himself, or be able to express whether he was hungry or full. He was created crown prince in 387 and ascended the throne in 397. Because of his disability, the actual power was controlled by his uncle,
Sima Daozi,
Prince of Kuaiji. During his reign,
regents and warlords dominated the Jin regime. Revolts by various governors also ravaged the land. From 398 to 403, there were constant revolts and civil war campaigns. In 403, the Jin regime was usurped by the warlord
Huan Xuan, and while Emperor An was restored in 404, the Jin Dynasty was nearing its end. With the warlord
Liu Yu as the actual power, Jin destroyed
Southern Yan and
Later Qin, greatly expanding its territory. However, with Liu Yu up in the north, the renegade governor of Guang Province (廣州, modern
Guangdong and
Guangxi),
Lu Xun, rebelled and threatened the capital city
Jiankang, before Liu Yu returned and crushed the revolt. In 419, Emperor An was
strangled under the order of Liu Yu and replaced with his brother
Emperor Gong, who would be the last emperor of the dynasty, before Liu Yu would take the throne and establish the
Liu Song Dynasty.