Cao Yu
Around 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 (曹宇), who would serve as a regent along with Xiahou Xian (夏侯獻), Cao Shuang, Cao Zhao (曹肇), and Qin Lang (秦朗). However, Cao Rui's trusted officials Liu Fang (劉放) and Sun Zi (孫資) were not on good terms with Xiahou Xian and Cao Zhao, and were apprehensive about them becoming regents. Eventually, Cao Rui was persuaded to appoint Cao Shuang and Sima Yi. Cao Yu, Cao Zhao and Qin Lang were excluded from the regency.