Sima Liang
As Emperor Wu grew ill in 289, he considered whom to make regent. He considered both Empress Yang Zhi's father Yang Jun and Sima Liang. As a result, Yang Jun became fearful of Sima Liang and had him posted to the key city of Xuchang. Several other imperial princes were also posted to other key cities in the empire. By 290, Emperor Wu resolved to let Yang and Sima Liang both be regents, but after he wrote his will, the will was seized by Yang Jun, who instead had another will promulgated in which Yang alone was named regent. Emperor Wu died soon thereafter and was succeeded by Emperor Hui. By this point, Sima Liang had not yet gone to Xuchang, but was fearful of Yang Jun, and so did not dare to attend Emperor Wu's wake. Yang was still suspicious that Sima Liang might have a coup in mind, and so prepared for his troops to attack Sima Liang. (Indeed, the justice minister He Xu (何勗) suggested to Sima Liang that he overthrow Yang, but Sima Liang refused.) In order to avoid a military confrontation with Yang, Sima Liang immediately left for Xuchang.