During the Xuanwumen Rebellion, Li Shimin, the King of Qin, killed the crown prince Li Jiancheng and the Qi king Li Yuanji, and in order to never have any trouble, he cut the grass and roots, and also killed all the sons of the two, and then took his sister-in-law, the beautiful Yang clan, back into the harem. This is a big deal against the world! "Politics is a bloody war" has been verified here again. When Taiyuan raised an army, Li Yuan, who was full of vigor, was blinded in the face of this earth-shattering event. Although, at that time, Li Shimin only wanted the position of prince and did not immediately ask him to step down. But Li Yuan, the emperor, had a very sad life, losing his son in old age, and he was two biological sons, plus more than a dozen grandchildren, and the others were very sad, not to say that they were very sad after suffering the blow.
Li Jiancheng and Li Yuanji's old department needed to be soothed, so that these opposition forces could quickly turn around, at least not to make trouble, to disturb the situation; Li Shimin gained the highest power through abnormal channels, and he wanted to give an account to his heroes, after all, people were following Li Shimin with their heads to do this vote, and what they needed was a reward that could be realized as soon as possible, even if Li Shimin was willing to wait for Li Yuan's abdication out of father-son feelings, the heroes under his hands could not wait.
At that time, the Turks invaded, twenty days after Li Shimin succeeded to the throne, Jieli Khan hit the outside of Chang'an City and on the banks of the Weishui River, Li Shimin did not have the time to push and give way according to the tradition, the military situation was like fire, solved the problem of the Turk invasion, and his position was stabilized by three points; secondly, it was necessary to arrange the capable people who joined hands to the appropriate position, such as military power and Chang'an public security, Du Ruqian's ability to make decisions was the first in the world, Chang'an City was handed over to him Li Shimin was assured, and Du Ruhan, who had conspiracies, could get the killer Wei Chi Jingde sent out to fight the Turks, so that everyone could see that Wei Chi could not only kill his own people, but that it was his true color to charge into battle and kill the enemy, which was to protect Wei Chi and avoid the land of right and wrong in Chang'an City; Qu Tutong was sent to Luoyang, and it was safe to hand over the eastern theater to Qu Tutong Li Shimin, and this old guy could only be used by Li Shimin.
When Li Yuan saw his sons shedding blood and fighting each other for their rights, I think his heart was very shaken. On the one hand, his Zen position is out of helplessness, on the other hand, I think it is also out of fear of his son Li Shimin's cold and cruel. On the other hand, if Li Shimin killed Li Jiancheng, Li Yuanji did not immediately gain supreme imperial power, and his remnants might return, so it was logical that Li Shimin forced his father Li Yuanchan to give up the throne.