In the history of China for thousands of years, dynasty alternation is a common occurrence. Even if it is not a dynasty change, there will be many traitors and villains. But among those historical figures who plan to usurp the throne, Sima Yi has the worst reputation, which makes historians feel this atmosphere. Why?

First, let's talk about two bad reputations: Cao Cao and Zhao Kuangyin. In fact, Cao Cao has a bad reputation, mainly because in the Romance of the Three Kingdoms, Cao Cao felt completely treacherous, and he forced the emperor to order his ministers. But from a historical point of view, Cao Cao's contribution is relatively large. With the efforts of Cao Cao, the Eastern Han Dynasty restored peace.

Let's talk about Zhao Kuangyin. He has a good reputation. Why? After Chen Qiao's mutiny, he added a yellow robe to his body and founded the Song Dynasty. He has two things that have earned him a good reputation. First of all, he did not kill all the emperors after he ascended the throne, but showed mercy to the abdicated emperors, which is very rare in history. Secondly, after the establishment of the Song Dynasty, efforts were made to create prosperity for the people. No matter who the emperor is, they only care about whether they can live a quiet life.

Finally, let me talk about Sima Yi. Why is his reputation so bad? There are two reasons. First, when Sima Yi pacified Liaodong, he quickly killed Gongsun Yuan, but killed 7,000 officials in Gongsun Yuan in one breath, and then moved all the locals to the mainland. As a result, Liaodong became a vacuum zone, which made Koguryo rise rapidly. This dynasty brought great trouble to China, which lasted for hundreds of years until the Tang Dynasty. The second reason is that after Sima Yi, Sima Yan established the Jin Dynasty, but this dynasty was conquered by the Xiongnu army, which made the people's spirit of the Jin Dynasty come at once, and then five chaos made the people in trouble, so people and historians didn't like Sima Yi.