Jia Nanfeng
Sima Wei was the fifth son of Jin's founding emperor Emperor Wu, by his concubine Consort Shen. In his childhood, he was created the Prince of Shiping. Late in his father's reign, circa 289, he was created the Prince of Chu and charged with the military commands of Jing Province (荊州, modern Hubei and Hunan). After his father died in 290, his brother Crown Prince Zhong ascended the throne as Emperor Hui. Empress Dowager Yang's father Yang Jun was regent, but many people were dissatisfied with his hold on power. One of those was Emperor Hui's wife Empress Jia Nanfeng, and she entered into a conspiracy with Sima Wei, among others, to overthrow Yang Jun. In 291, Sima Wei returned to the capital Luoyang with his troops, and soon a coup happened.