In 238, Cao Rui perished at age 35. He was succeeded by his adopted son Cao Fang (aged 7), who was a close member of the imperial family. Cao Rui had appointed Cao Shuang and Sima Yi to be Cao Fang's regents, even though he had contemplated to establish a regency council dominated by imperial family members. Cao Shuang held the principal control over the court. Meanwhile, Sima Yi was received the honorific title of Grand Tutor, but had virtually no influence at the court.