Sima Lun
As an imperial prince, Sima Jiong had a sizable number of troops under his command. When Sima Lun overthrew Emperor Hui's domineering wife Empress Jia Nanfeng in 300 after she murdered Emperor Hui's crown prince Sima Yu, Sima Jiong was a participant of the coup — despite that Empress Jia was his half-maternal-aunt, given that his mother had a hatred with Empress Jia. But Sima Jiong did not receive great rewards afterwards. He therefore resented Sima Lun. Sima Lun, seeing his resentment, tried to appease him by giving him an important military command—of Xuchang (許昌, in modern Xuchang, Henan).