Emperor Hui of Jin (; 259 - January 8, 307), personal name
Sima Zhong (司馬衷),
courtesy name Zhengdu (正度), was the second emperor of the
Jin Dynasty (265-420). Emperor Hui was a
developmentally disabled ruler, and throughout his reign, there was constant internecine fighting between
regents, imperial princes (his uncles and cousins), and his wife
Empress Jia Nanfeng for the right to control him (and therefore the imperial administration), causing great suffering for the people and greatly undermining the stability of the Jin regime, eventually leading to
Wu Hu rebellions that led to Jin's loss of northern and central China and the establishment of the competing
Sixteen Kingdoms. He was briefly deposed by his granduncle
Sima Lun, who usurped the throne himself, in 301, but later that year was restored to the throne and continued to be the emperor until 307, when he was poisoned, likely by the regent
Sima Yue.