Prince of Chu
After the Incident at Gaoping Tombs, Sima Yi promoted Wang Ling, the general in charge of Shouchun, to the rank of Grand Commandant (太尉). Wang Ling and his nephew Linghu Yu (令狐愚) felt that the emperor Cao Fang was too young to rule, and saw that Sima Yi was actually the one in control of state power. They planned to depose Cao Fang and replace him with Cao Biao, the Prince of Chu. Linghu Yu sent his subordinate Zhang Shi (張式) to contact Cao Biao.