Si Mazhao, the most powerful minister, has the ambition to usurp the throne, so why didn't he succeed to the throne before his death?

Si Mazhao wanted to be emperor, but Cao Mao was killed for rebellion, which made Si Mazhao carry the ambition of regicide and tarnished Si Mazhao's reputation, so Sima Cai Zhao never dared to be emperor.

First of all, through the efforts of Sima Yi, the powerful Sima family in Si Mazhao finally surpassed Cao Wei. Especially in the period of Si Mazhao, when the power reached the sky, he became emperor. In fact, Si Mazhao really had all the conditions at that time, and it was easy to become an emperor. It's a pity that Si Mazhao can only be king for life, because he can't face the people's accusations. The dynasty he established, even if he ascended the throne, was a great irony. Si Mazhao took great pains to be emperor. First, he used his power to promote himself in various ways, and he also formed his own bureaucratic group.

Second, Cao was resisted by Mao, and Si Mazhao's dream was shattered. If Si Mazhao wanted to usurp the throne at that time, there wouldn't be too many people in the court or even the whole Cao Wei to stop him. But Sima Chao didn't go any further and gave up his good chance. It was not until Sima Yan came to power that he was made emperor. When Si Mazhao was in power, most of the Sima family held important military and political positions in the imperial court, and they were absolute monarchs. Si Mazhao constantly promoted his title by bullying the imperial court, preparing for becoming emperor. But it was a pity that Cao Mao, the puppet emperor at that time, was unwilling to be fiddled with at will, and then died for no reason, so he launched a counterattack. He rebelled against Si Mazhao with suicidal behavior, and was finally killed by Si Mazhao's confidant. Si Mazhao's dream was shattered by the death of the puppet emperor.

Third, Si Mazhao cannot claim to be the emperor. It was because he killed the puppet emperor that some people were completely wary of Si Mazhao. After all, the act of killing the king is a disgrace for generations. Even if Si Mazhao becomes emperor, he will be blamed by everyone. It can be said that the puppet emperor is also very clever, which makes Si Mazhao unable to claim the title of emperor.