#OTD 249 CE in #ChineseHistory: #Coup at Gaoping Tomb #高平陵之變. Sima Yi #司馬懿 (179–251), regent of Wei #魏 Emperor Cao Fang 曹芳, staged a coup d'état against his co-regent Cao Shuang 曹爽 when the latter was visiting the #imperial tombs outside the capital with the emperor.