Du Chongwei
In late 947, Li Chengxùn died. This greatly affected Liu Zhiyuan's health, and by spring of 948 he was on the edge of death. He summoned the chancellor Su Fengji, the chief of staff ("Shumishi") Yang Bin, the Imperial Guard commander Shi Hongzhao, and the deputy chief of staff Guo Wei, and told them "My remaining time is short, and I cannot speak much. Chengyou is still young and weak, so I entrust to you what happens after my death." He also told them to guard against the retired general Du Chongwei. After he died, the four did not immediately announce his death but instead issued an edict in his name putting Du to death. They also issued an edict in his name making Liu Chengyou the Prince of Zhou and giving him the title of Chancellor (同中書門下平章事, "Tong Zhongshu Menxia Pingzhangshi"). Shortly thereafter, they announced that the emperor had passed away, and Liu Chengyou took the throne at the age of 17. He honored his mother Empress Li as empress dowager.