In ancient Chinese history, Cao Cao was nothing more than a very controversial role, in the Romance of the Three Kingdoms, Luo Guanzhong unceremoniously borrowed Zhuge Liang's mouth and said that he was a Cao Thief, the reason was nothing more than because he blackmailed the Son of Heaven to order the princes, but there were just as many people who liked Cao Cao and hated Cao Cao, and Cao Cao once wrote in 210 AD "Let the County Smug Hundred Ben Zhi Ling": "Let the world be alone, I don't know when several people call emperors, several people call kings", and he and Liu Bei Sun Quan are the only ones who do not claim the title of king. Marrying three daughters to the same person can also be said to be Cao Cao's wisest choice, and it also reflects his ambition.
The only thing that can make Cao Cheng marry a daughter is when the Emperor of the Heavenly Son Han Offers, people know that eggs should not be put in a basket, why would Cao Cao make such a move? We can see what Emperor Xian of Han did in the past few years when Cao Cao blackmailed Tianzi to order the princes.
Cao Cao took charge of the power of the dynasty, although Emperor Xian of Han was forced to be helpless, but he must be unwilling, whether it was him, or the gang of people in the old dynasty, must be unwilling, in ancient Chinese history, the emperor wanted to contain those high-powered ministers in the means of no more than two, one is to rely on eunuchs, the other is to rely on foreign relatives.
As for Emperor Xian of Han, the attendants around him were all set up by Cao Cao, so he could only rely on foreign relatives. In the fifth year of Jian'an (200), Liu Xie was not satisfied with Cao Cao's monopoly of power, so he secretly took the edict and entrusted Dong Guiren's father, the che general Dong Cheng, to try to kill Cao Cao, Dong Cheng and Liu Bei, and Wang Zifu immediately began a conspiracy. Whether this edict was written by Emperor Xian of Han has yet to be examined, after all, at that time, Yuan Shao was not removed, saying that the emperor's Yuan Shu was defeated not long after, and there were warlords such as Sun Ce Zhang Lu, Cao Cao's treatment of Emperor Xian of Han was OK, Liu Xie was unlikely to do the thing of self-destruction of the city wall, at that time Dong Cheng insisted that the edict was given to him by Emperor Xian of Han, so that Yuan Shao asked Cao Cao and Zhuge Liang's Northern Expedition to the Central Plains, and "Bong Zhao and Begging Thieves" was talking about the Yi Belt Edict.
In the end, the matter of "wearing the edict" was revealed, Dong Cheng and others were cursed, and the pregnant Dong Guiren was also killed by Cao Cao, Cao Cao did not move the Han Emperor, he estimated in his heart that the example of Yuan Shu was in front of him! In 214, Empress Fu of the Han Dynasty wrote to her father Fu Quan, hoping that he would find an opportunity to kill Cao Cao, but this matter was also exposed, which eventually led to Cao Cao's claustrophobia of Empress Fu and her death, Liu Xie and the two princes she gave birth to were also poisoned with poisoned wine, and more than a hundred members of the Fu clan were executed.
After these two things, Cao Cao became more and more cautious, Empress Fu was gone, Emperor Xian of Han naturally had to choose his wife, whose daughter handed him the most at ease? Of course it's your own. In the eighteenth year of Jian'an, Cao Cao took the 50,000 horses of Shu Shu Xuan as a dowry for his engagement, and married his own daughters Cao Xian, Cao Jie, and Cao Hua to Liu Xie, the Emperor of Han, as his wife. The young ones are temporarily left in the feudal country, and then sent to the palace when they are old enough to be married. In 215, Cao Cao had Emperor Xian of Han formally make Cao Jie empress.
Cao Cao is indeed very clever in doing this, he does not have to worry about the problem of foreign relatives interfering in politics, and the second point, even if he dies in the future, it is the son of Emperor Xian of Han and Cao Jie sitting in the world, then he who has the blood of the Cao family will naturally let the Cao family continue to win a meritorious name and wealth, even if Cao Jie does not have a son, then Cao Xian Cao Hua's son can also become an emperor! Therefore, Cao Cao's decision was also considered for the long-term future.
However, what Cao Cao did not expect was that in 220, his son Cao Pi took the position of Emperor Xian of Han, and looking at the face of the nominal Chan Rang and his sister, Cao Pi did not embarrass Emperor Han, but made him feel at ease to become a Duke of Shanyang.