Answer
Cao Fang was the third emperor of the state of Wei during the Three Kingdoms period of China. He was the son of Cao Rui and inherited the throne after Cao Rui's death in 239. Cao Fang was a weak and ineffectual ruler, and the real power behind the throne was Sima Yi, who co-presided as a regent with Cao Fang's mother, Empress Dowager Guo.