Sima Jiong
| Sima Jiong | |||||||||
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| Prince of Qi (齊王) | |||||||||
| Tenure | 28 April 283 – 27 January 303 | ||||||||
| Predecessor | Sima You | ||||||||
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| Father | Sima You | ||||||||
| Mother | Jia Bao/Quan (贾褒/贾荃) | ||||||||
Sima Jiong (Chinese: 司馬冏) (before 283 – 27 January 303), courtesy name Jingzhi (景治), formally Prince Wumin of Qi (齊武閔王), was an imperial prince of the Jin dynasty of China. He briefly served as Emperor Hui's regent after overthrowing the usurper Sima Lun in May 301. He was the fourth of the eight princes commonly associated with the War of the Eight Princes.
The son of Sima You, he played a role in Sima Lun's coup against Empress Jia and her family, but was later transferred away from the capital, Luoyang to guard the city of Xuchang. When Sima Lun usurped the throne from Emperor Hui, Sima Jiong raised an army and led the coalition of the "Three Princes" (三王) to restore Emperor Hui to the throne. He was appointed the new regent of Emperor Hui after Sima Lun's defeat, but his arrogant and wasteful personality made him deeply unpopular within the court. Soon, his former allies the Prince of Hejian, Sima Yong and the Prince of Chengdu, Sima Ying accused him of treason and threatened Luoyang with their forces. Believing that the Prince of Changsha, Sima Ai was in league with the two from inside the city, Sima Jiong wanted to execute him first, but Ai retaliated and killed him after a few days of fighting.