Cao Mao (onyomi: Sō Bō) is Cao Pi's grandson who succeeded the throne after Cao Fang's removal from power via Dowager Guo's act by the request of Sima Shi; but due to Cao Mao's young age at the time, Sima Shi was still technically in control of the court. He eventually tried to reclaim power from the Sima clan, but was killed in his coup. He was the fifth emperor of Wei and the last one who held actual power.