We read all the lead to present a different history.
Li Yuan's rebellion was instigated by Li Shimin, and li Yuan personally promised to give Li Shimin the throne, but the crown prince was Li Jiancheng. Li Shimin would not be unaware of what his father and his eldest brother would do to him, so he only had to strike first, so the Xuanwumen Revolution broke out. The change of Xuanwumen can be said to be one of the most successful seizures of power in ancient Chinese history, but although successful, the object of Li Shimin's seizure of power is his father after all, after this seizure of power, the feelings of Li Shimin and Li Yuan have also become very rigid.
The rigidity of the father-son relationship between Li Yuan and Li Shimin is said in layers, and the beginning is the three years from the ninth year of Wu De to the third year of Zhenguan. Li Yuan's treatment has been declining, originally Li Yuan could still live in the Taiji Hall of the Emperor's Residence, and Li Shimin still lived in the Prince's Eastern Palace, but later Li Shimin had no reason to directly drive Li Yuan to a partial hall. During the third year of Zhenguan, Li Yuan's greatest reliance on Pei Huan in the imperial court was belittled by Li Shimin, and Li Yuan lost the ability to influence the imperial court. The most crucial point is that when Zhenguan was in the third year, the world was in a great drought, it was very unpeaceful, Li Shimin's throne was very unstable, Li Yuan could be restored at any time, and Li Shimin naturally had to make this decision in order to prevent the throne from being taken away.
The second layer of time point, that is, the fourth year of Zhenguan to the ninth year of Zhenguan, before we can find that the relationship between Li Shimin and Li Yuan is not a relationship between father and son at all, but an intolerable relationship between the leaders of the two political sects, because Li Yuan is his father Li Shimin, who is not good at killing him, so he has to be put under house arrest. However, after four years of Zhenguan, the situation of the Tang Began to flourish, the Turks in the north were defeated by the Tang, and the national strength became very strong, and Li Shimin became the common king of all ethnic groups, "Heavenly Khan".
Li Shimin's political foundation became very solid, Li Yuan completely became the Emperor Taishang, unable to threaten Li Shimin, and Li Yuan, who had lost the threat, was no longer the leader of the hostile political sect in Li Shimin's eyes, but an old father who had no ability to resist, and naturally had no wariness against him. Li Yuan also has self-knowledge, he knows that Li Shimin's wings are already abundant, and he cannot restore li Shimin when his wings are not strong, so now it is even more impossible, and Li Yuan has begun to slowly accept his son. In the eighth year of Zhenguan, Li Shimin built a Taiji Palace for Li Yuan, and also let Li Yuan participate in the military parade ceremony of the Tang Dynasty, which can be said to treat Li Yuan as a real Emperor Taishang.
Although the relationship between Li Yuan and Li Shimin has improved at this point in time, Li Yuan is still a little afraid of Li Shimin from the bottom of his heart, after all, Li Shimin can kill his own eldest brother and third brother without mercy, then he may be the same for his father. In the sixth year of Zhenguan, Li Shimin went to Jiucheng Palace and sent someone to invite his father Li Yuan to come with him, but Li Yuan refused to go, saying that he was not in good health and could not go. But at that time, Li Yuan could even go out hunting, so the so-called poor health was just a reason to shirk, and he was reluctant to participate with his son Li Shimin in activities that did not involve many ministers.
After Li Yuan's death, Li Shimin's attitude was not very good, generally speaking, the tomb of the emperor's relatives and relatives would be written on the outside of the tomb with words such as: "There is no gold and silver treasure in this tomb", but Li Yuan's tomb did not, which is easy to attract tomb robbers to patronize, and from the events behind him, you can also see that Li Shimin is not willing to see Li Yuan