During the Three Kingdoms period, the transformation of Gaopingling became an important event in the history of the Three Kingdoms, which had a profound impact on Cao Wei and the entire pattern of the Three Kingdoms. In 249 AD, Cao Fang went to Gaoping Mausoleum to worship Emperor Wei Ming, accompanied by Cao Shuang and others, but Sima Yi took the opportunity to play Empress Dowager Guo to remove Cao Shuang's brothers and successfully control Luoyang. Cao Shuang had the opportunity to fight back, but due to his greed for glory, he finally gave up resistance, resulting in Sima Yi successfully grasping the power of Cao Wei through the Gao Pingling Incident.
Why don't you just call yourself emperor?
One. Specifically, Sima Yiwei was proclaimed emperor for the following reasons. First, Sima Yi began his army in 249 AD, but died of illness in 251 AD, just two years later. The usurper took time to complete key steps, which Sima Yi's brief reign could not complete. Compared with Cao Cao and Cao Pi, Sima Yi's age limit was also a major factor, he was already seventy years old at the time, which made Cao Shuang defenseless against him and eventually died.
Secondly, after Cao Shuang was killed, Sima Yi held the power of Cao Wei, but failed to be crowned a prince and king, which was a necessary step to become an emperor. It was only after completing these steps that Cao Cao became King of Wei, and Cao Pi eventually usurped the Han dynasty in 220 AD.
Two. 
Cao Cao's son, Cao Pi, completed the steps of conferencing himself as a prince and becoming king during his reign, and finally usurped the Han dynasty in 220 AD. Sima Yi's highest position during his lifetime was Taifu, and he did not complete these steps. Age is also a limiting factor, and if he usurps the throne and becomes emperor at a younger age, Sima Yi may have a chance.
Three. 
During his reign, Sima Yi had already faced the challenge of the Huainan Three Rebellions. The Huainan Three Rebellions occurred in the late Cao Wei period, and Shouchun's generals rebelled against the Sima Yi family three times. If Sima Yi were to become emperor, it could trigger an even more violent rebellion, exacerbating Cao Wei's internal turmoil and putting him in a dangerous position.
Four. 
In the end, Sima Yi's exploits were still not enough compared to Cao Cao. Cao Cao made great contributions to the conquest of the Quartet and the subjugation of separatist forces, while Sima Yi's contributions were mainly focused on resisting Zhuge Liang's Northern Expedition and other battles. Without enough merit and prestige, the emperor may be revolted.
Epilogue. 
Sima Yiwei's decision to become emperor stemmed from a number of factors, including a short period of time, age restrictions, the threat of internal rebellion, and insufficient merit. This decision influenced the subsequent historical development of Cao Wei and added a tortuous chapter to the political situation during the Three Kingdoms period.
Cao Wei's conspiracy Why didn't Sima Yi become emperor after usurping the throne?The article profoundly analyzes the changes in Gaopingling during the Three Kingdoms period and the reasons why Sima Yi was not proclaimed emperor. The political turmoil and power struggle during this historical period make the article have profound historical connotations, and through the analysis of Sima Yi's political strategy, Cao Shuang's miscalculation and other related factors, it presents a vivid and complex political picture for readers.
First of all, the article vividly describes the Gaopingling Incident, highlighting the far-reaching impact of this historical event on the historical pattern of Cao Wei and the entire Three Kingdoms. The author's vivid and detailed description of Cao Fang's worship of Emperor Wei Ming in 249 AD and Sima Yi's taking the opportunity to control Luoyang enables readers to gain an in-depth understanding of the development of events and lays a solid foundation for subsequent analysis.
Secondly, by analyzing Cao Shuang's miscalculations and Sima Yi's political methods, the article explains why Sima Yi did not claim the throne immediately after usurping the throne. This in-depth analysis of Cao Shuang's decision to covet glory and give up resistance presents readers with the psychology of power in the political wrestling during the Three Kingdoms period. Sima Yi's political tactics were ingenious and cunning, and he demonstrated his outstanding political wisdom by seizing power over Cao Wei and eliminating opposition forces, and finally succeeded in usurping power.
This paper further analyzes the reasons why Sima Yi was not proclaimed emperor, and explains the logic behind this political decision from multiple perspectives. Factors such as the short period of time, age restrictions, the threat of internal rebellion, and insufficient merit are all powerfully enumerated and analysed, giving the reader a more comprehensive understanding of the political environment and Sima Yi's decision-making during this historical period.
Finally, the article mentions the threat posed to Sima Yi by the Huainan Three Rebellions, emphasizing that if Sima Yi were proclaimed emperor, it could trigger an even more violent rebellion, which would have a negative impact on the internal turmoil of Cao Wei. This adds historical complexity to the article, allowing the reader to better understand the political situation and power struggles of the time.
Overall, this essay vividly illustrates the complexity of Cao Wei's period of political turmoil through an in-depth analysis of important events and figures during the Three Kingdoms period. The author's grasp of historical details, the rigor of logical reasoning, and the deep insight into the psychology of the characters all provide readers with a useful historical enlightenment.
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