Sima family controls Wei

The long years of battle between Shu and Wei saw many changes in the ruling Cao family in Wei. The Cao family gradually grew weak after the death of Cao Rui and Sima Yi slowly plotted to usurp the throne. Sima Yi removed Cao Shuang, a powerful noble of Wei from power with a cunning strategy and since then the power of Wei had been in the hands of Sima Yi. After Sima Yi’s death, his sons Sima Shi and Sima Zhao continued wielding the power of Wei in their hands. Sima Zhao had Cao Fang removed from the throne and replaced Cao Fang with Cao Mao. Later, Cao Mao tried to assassinate Sima Zhao, who had the intention of usurping the throne, but was killed by Sima Zhao’s subordinate. Sima Zhao pretended to grieve and mourn Cao Mao’s death and even later had his subordinate, whom he ordered to kill Cao Mao, executed for committing regicide.