Indeed, later in 254, Cao Fang himself would not be spared (although he was spared his life). Some of his associates had suggested to him to, when Sima Shi's brother Sima Zhao was at the palace to visit him, kill Sima Zhao and then seize his troops and attack Sima Shi. Cao Fang could not resolve to do it, but the news still leaked, and Sima Shi deposed Cao Fang. It was during this incident that Empress Dowager Guo would display her wisdom in a last-ditch attempt to preserve some possibility of preventing the Simas from taking complete control over Wei. When Sima Shi notified her that he intended to make Cao Pi's brother Cao Ju (曹據), the Prince of Pengcheng, emperor, she managed to persuade him that such a succession would be improper – that since Cao Ju was the uncle of her husband Cao Rui, such a succession would leave Cao Rui effectively with no heir. Sima Shi was forced to agree with her, and he made, as she suggested, Cao Mao (the Duke of Gaogui District), the son of Cao Rui's younger brother Cao Lin, emperor instead. (Cao Mao, although young (at age 13) was known for his intelligence, and Empress Dowager Guo might have believed that he, alone of the princes and dukes, might have had a chance of counteracting the Simas.) When Sima Shi asked her for the imperial seal, she again reasoned with him and refused politely, under the reasoning that she had met Cao Mao before and wanted to personally hand him the seal.