After Sima Zhao's death, his eldest son Sima Yan succeeded to his throne, and Sima Yan followed Cao Pi's example in the same year and forced the Wei Emperor Cao Huan to concede, and the Wei state was destroyed, less than 30 years after Cao Rui's death.

【Sima Yan usurped the throne】

Sima Yan, whose name is Anshi, is the eldest son born to Sima Zhao and Wang Yuanji, and Sima You is his younger brother. He was generous, generous, deep and measured.

During the Jiaping period (249~254), Sima Yan was first named the Marquis of Beiping Pavilion, and successively served as the lieutenant of the middle of the matter, the captain of Fengche, the general of the middle base, and the general of the cavalry. Later, Cao Huang, the township prince of Yingchang Dao in Dongwuyang, ascended the throne, moved to the Zhongfu Army, and was named the Marquis of Xinchang Township.

In history, because Sima Shi had no queen, Sima You was later succeeded to Sima Shi, in the name of Sima Shi's son, after Sima Zhao took power, he thought that his power came from his brother, so he attached great importance to Sima You, and said many times: "This is King Jing's world, I will not participate in it." ”

Sima Zhao regarded Sima You as different, took special care, thought that he was in the position of prime minister, and felt that he should pass on the great cause to Sima You after his death. After the establishment of the Jin Kingdom, when Sima Zhao was about to agree on the prince, he also wanted to establish Sima You. However, it was opposed by the ministers, among whom He Zeng and others insisted on dissent, saying: "Zhongfujun (Sima Yan) is smart and martial, and has supernatural talents. Hair mopping the floor, arms over the knees, this is not the appearance of a minister! Since then, it has been decided, Sima Yan has become the prince, and he has been awarded the general of the Fujun, the opening of the mansion, and the deputy second prime minister.

In the second year of Xianxi (265), Sima Zhao died of a stroke, and Sima Yan inherited his father's position as Xiangguo and the title of King of Jin. In December of this year (266), Sima Yan repeated the story of Cao Pi that year, and forced Emperor Cao Huan Chan of Wei Yuan to enthrone him as emperor, set the name of the country as Jin, and changed the Yuan Taishi, Sima Yan is also the founding emperor of the Jin Dynasty in Chinese history.

【Sima Yan and Sun Quan】

After Sima Yan was called emperor, he first set up his concubine Yang Yan as the queen, and then set up his second son Sima Zhen as the crown prince, and also respected his grandfather Sima Yi as Emperor Xuan in the first year of Xianning (275), the temple number was Gaozu, the eldest uncle Sima Shi was Emperor Jing, the temple number was Sejong, his father Sima Zhao was Emperor Wen, and the temple number was Taizu. That is to say, Sima Yan gave his uncle Emperor Sima Shi the treatment, but Sun Quan, who was far away in Jiangdong, only gave his brother Sun Ce the treatment of the king, so some people in later generations thought that Sun Quan was inferior to Sima Yan.

But the situation of the Sima family and the Sun family is actually very different, you must know that as early as after Sima Zhao was crowned king, the Wei court had posthumously crowned Sima Yi, Marquis of Xuanwen of Wuyang, as the king of Jin Xuan, and Sima Shi, Marquis of Zhongwu of Wuyang, as the king of Jing. Sima Yan actually only inherited his father's past posthumous advice here, and changed the prince to the throne, Sima Shi's status in the Jin Dynasty was actually clear to Sima Zhao a long time ago, and his eldest son Sima Yan only inherited his father's past policies.

And the reason why Sima Zhao and Sima Yan's father and son recognized Sima Shi's prince and throne is that Sima Shi himself has no queen, and he can't threaten Sima Zhao's lineage also has a lot to do with it, which is completely different from Sun Quan's situation as emperor, Sun Ce has his own son, if Sun Quan recognizes Sun Ce's throne, it is equivalent to admitting that Sun Ce's surviving children also have the right to inherit Sun Wu, this specific situation is not the same at all, there is no need to forcibly compare.

【The Last Emperor Cao Huan】

Cao Huan, whose real name is Cao Huang, is Jingming, born in the seventh year of Zhengshi (246), is the grandson of Cao Cao, Emperor Wu of Wei, the nephew of Cao Pi, Emperor Wen of Wei, and the son of Cao Yu, King of Yan. In the third year of Ganlu (258), he was named the village prince of Changdao.

In May of the fifth year of Ganlu (260), Emperor Cao Chao of Wei staged a coup d'état and was killed, and Sima Zhao, who was in power, decided to appoint Cao Huang as emperor after consulting with the ministers. So Sima Zhao sent his son, Sima Yan, the middle protector, to Yecheng to meet Cao Huang.

In June of the same year, the Empress Dowager Guo issued an edict to change Cao Huang's name to Cao Huan. After Cao Huan became the emperor, the first thing he did was to canonize Sima Zhao as the Duke of Jin and Xiangguo again, and add the gift of Jiuxi to show his attitude, of course, because of the coup d'état, Sima Zhao could not accept it.

With the experience of Cao Fang and Cao Chao, Cao Huan has completely become the puppet of the Sima family, and all the power has fallen into the hands of Sima Zhao, and he himself has no power in the court.

Later, in August of the second year of Jingyuan (261) and February of the fourth year of Jingyuan (263), Cao Huan repeated the title of Duke to Sima Zhao, but Sima Zhao refused, but it was only three, in October of the fourth year of Jingyuan (263), Sima Zhao sent troops to attack Shu, and the good news was repeated, Zhonghui even captured Hanzhong, Cao Huan added Sima Zhao for the fourth time as the Duke of Jin, Xiangguo, and added the gift of Jiuxi, Sima Zhao finally accepted.

In the first month of the second year of Xianxi (265), Empress Dowager Guo died, as the wife of Cao Rui, Empress Dowager Guo had great influence at that time, Sima Yi launched a coup d'état in Gaopingling, and Biqiu Jian held her name when he rebelled in Huainan, and her death was even worse for Cao.

In this year, Sima Zhao also successfully destroyed Shu Han, and in the face of this immortal achievement, Cao Huan had to further crown Sima Zhao as the king of Jin, laying the foundation for Sima Yan's future usurpation. In the same year, Sima Zhao died, and his eldest son forced Cao Huan to give in, and the Wei State officially collapsed, and Cao Huan also became the last monarch of the Wei State. When leaving, Taifu Sima Fu went to pay his respects, held Cao Huan's hand, burst into tears, couldn't control himself, and said: "On the day of his death, the minister is also a pure minister of Great Wei." ”

However, because Cao Huan is far more obedient than Cao Fang and Cao Chao, so the Jin State treats him very well, and later Sima Yan not only named Cao Huan as the king of Chen Liu, and the palace was arranged in Yecheng, but also let him use the flag of the Son of Heaven, prepare the deputy car at five o'clock, and go to Wei Zhengshuo, and the suburban heaven and earth music system imitated the system of the early Wei State, giving him the treatment of not being a minister and not worshipping the edict.

In the first year of Tai'an (302), Cao Huan died in Chenliu Fengguo at the age of fifty-eight, and the imperial court named him Emperor Yuan, and his descendants were called "Emperor Wei Yuan". Cao Huan's status, treatment, and ending can be said to be the best among the kings of the past dynasties. He can have such a good treatment, it can be said that Cao Chao has at least half of the credit, without Cao Chao's reference, Cao Huan's treatment is estimated to be reduced by more than eighty percent.

【Sima Family Era of Wei State】

In the first year of Jiaping (249), after the coup d'état of Gaopingling, the Wei State began to enter the era of the Sima family, and was successively held by Sima Yi, Sima Shi and Sima Zhao's father and son, and after Sima Zhao's death, his eldest son Sima Yan immediately usurped the throne.

When the Sima family was in power, Cao Cao had been dead for almost thirty years, his influence was already very limited, and the Cao family had declined to a very dangerous point, especially after Cao Shuang was beaten, the foundation of the Cao family was no longer there.

After the Sima family came to power, it was more intensive, took a lot of effective measures to restore the people's livelihood, won a lot of popular hearts, and also tried to restore Cao Wang Ling, Biqiu Jian, Cao Chao and Zhuge Dan and other people all eliminated, the ruler of Wei has actually changed from the Cao family to the Sima family, and then the Wei State destroyed Shu and the Jin Dynasty destroyed Wu is actually the credit of the Sima family, and it has nothing to do with the Cao family.