Wei's second emperor Cao Rui at a young age. He was instated as the Prince of Qi in September 235.

In early January 239, when Cao Rui became ill, he resolved to pass the throne to Cao Fang. Initially, he wanted to entrust Cao Fang to his uncle Cao Yu ??, who would serve as a regent along with Xiahou Xian ???, Cao Shuang, Cao Zhao ??, and Qin Lang ??. However, Cao Rui's trusted officials