In the long history of the Three Kingdoms period, Sima Yi, as an important strategist and powerful official of the Wei Kingdom, was widely praised for his wisdom and strategy by later generations. However, despite his exceptional wisdom in political struggles, he also had his own fears. So, who did Sima Yi fear the most: Cao Cao, Cao Pi, or Cao Rui?

Firstly, for Cao Cao, Sima Yi undoubtedly held him in awe and fear. As the King of Wei, Cao Cao's authority and cunning gave Sima Yi a lot of pressure. However, during Cao Cao's lifetime, Sima Yi did not have too much power, so his fear was more likely to be awe towards Cao Cao's cunning and authority.

Then came Cao Pi, towards whom Sima Yi's fear may have been deeper. After Cao Pi ascended the throne, Sima Yi began to gradually gain power, but this also meant that he had to face more complex political struggles. Cao Pi's suspicion and paranoia made Sima Yi constantly vigilant to avoid being suspected by him. Therefore, Sima Yi's fear of Cao Pi was more towards his unpredictable personality and possible political attacks.

Finally, Cao Rui, the son of Cao Pi, was the one whom Sima Yi assisted in ascending the throne. By this time, Sima Yi had already gained most of the power, so his fear of Cao Rui may have been relatively smaller. However, he still needed to be constantly vigilant to avoid Cao Rui's suspicion or being exploited by other forces.

Overall, Sima Yi had varying degrees of fear towards Cao Cao, Cao Pi, and Cao Rui. This fear stemmed from their attitudes and behaviors towards him, as well as the potential political risks they posed. However, it was this fear that pressured Sima Yi to remain vigilant and survive in the complex political environment.

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