사마소
After Cao Mao's death, public sentiments called for Jia Chong's death, but what Sima Zhao did first was to force Empress Dowager Guo to posthumously demote Cao Mao to common citizen status and order that he be buried as such. He also executed Wang Jing and his family. The next day, after pleas from his uncle Sima Fu, Sima Zhao instead had Empress Dowager Guo order that Cao Mao be demoted back to a duke, but buried with the ceremonies of an imperial prince. Sima Zhao then summoned Cao Huan, the Duke of Changdao, and a grandson of Cao Cao, to the capital to become the emperor; by now, Empress Dowager Guo was powerless to speak further. In the midst of these events, Sima Zhao went on to decline the Nine Bestowments and the promotions towards state chancellorship and the title of Duke of Jin. Some days later, Sima Zhao publicly accused Cheng Ji and his brothers of treason and had them and their family executed to appease public sentiment while sparing Jia Chong. No one dared to act against Sima Zhao even in the aftermaths of the emperor's death, however, for Sima Zhao was effectively the imperial authority by this point. On 27 June, Cao Huan entered Luoyang and became emperor. Two days later, Sima Zhao forced Cao Huan to confer upon him the Nine Bestowments as well as the promotions towards state chancellorship and the title of Duke of Jin, which he earnestly declined, as well as another time in October.