Cao Shuang
In 249, Sima launched a coup to seize power from Cao Shuang. While Cao Fang and Cao Shuang left the capital Luoyang to visit Cao Rui's tomb, Sima rallied a group of anti-Cao Shuang officials and closed all gates of Luoyang. He sent an edict to Cao Fang in the name of Empress Dowager Guo, accusing Cao Shuang of dominating and corrupting the government, and demanding that Cao Shuang and his brothers be removed from power. Cao Shuang eventually decided to surrender his authority, against the advice of Huan Fan. Sima promised Cao Shuang that he could still retain his titles. However, not long later, Sima had Cao Shuang and his family and associates executed on charges of treason. By then, Sima Yi was in complete control of the government.