If I say that the most capable emperor of the Tang Dynasty was Li Shimin, I am afraid that not many people would oppose it. Before ascending the throne, Li Shimin had great achievements and prestige; after ascending to the throne, he opened up the territory and made great efforts to govern, and single-handedly created the "rule of Zhenguan". However, the emperor, as a person, always has some black spots, and the biggest black spot in Li Shimin's life is that he killed his brother and killed his father, and this evaluation comes from the tragedy of the Tang Dynasty - the change of Xuanwumen. It is not bad to say that the relationship between the Tang Dynasty was very chaotic, after all, Tang Xuanzong married his own daughter-in-law, and Tang Taizong's daughter had an affair with the monk. But something like Li Shimin is still relatively rare.
The general saying is that Li Jiancheng, who was the crown prince, was jealous of his younger brother Li Shimin, so he joined forces with his third brother Li Yuanji to persecute Li Shimin repeatedly, and Li Shimin could not bear it and killed Li Jiancheng and Li Yuanji at Xuanwu Gate. Let's first look at the victim Li Jiancheng, most people say that Li Jiancheng is a wine bag and a rice bag, of course, the real Li Jiancheng in history is not like this, Li Yuan was the soldier Li Jiancheng went to recruit when he raised his army in Jinyang; Li Yuan sent troops to attack Hexi, that is, Li Jiancheng attacked down and the war lasted only nine days, it can be said that Li Jiancheng's military talent is very outstanding, at least with Li Shimin is a grade.
Li Jiancheng's military achievements came to an abrupt end after the founding of the country, for the simple reason that he was made crown prince. As the crown prince, the identity of the crown prince determined that he could not leave the capital, could not lead the troops to fight, which meant that there was no military merit, no military merit meant that there was no prestige, and the state affairs were managed by his father Li Yuan, and his fame was not as good as a day; on the contrary, his second brother Li Shimin, after the founding of the country, was sent out by his father to eliminate other separatist forces because of his bravery, like pacifying Liu Heimin and Wang Shichong were all done by Li Shimin. As Li Shimin's military exploits increased, Li Yuan found that he could no longer give Li Shimin any rewards, and he wanted to invent a new position for Li Shimin, the General of Divine Strategy, Li Shimin knew that this thing was of no use, but Li Yuan let Li Shimin open a mansion alone, which Li Shimin did not think of.
Opening a separate government meant that Li Shimin began to have his own team, in other words, Li Shimin could establish a small imperial court in the General's Palace. Li Jiancheng was not a fool, and began to fight back, and he used a ruse to get rid of Luo Cheng. For a while, everyone in Li Shimin's team was in danger, and Li Jiancheng would not kill them now, but Li Jiancheng would definitely attack them after he took the throne. His own leader Li Shimin and Li Jiancheng were brothers, and at best they relieved Li Shimin of his rights. We are not related to Li Jiancheng, and we are lucky not to be exterminated by the Nine Tribes. The only way was to make Li Shimin emperor, but Li Jiancheng was really not wrong, so he could only kill people, and everyone instigated Li Shimin. Li Shimin naturally knew the benefits of the emperor, so he went down the slope and blatantly launched the Xuanwumen Revolution, and finally ascended to the throne.
Li Shimin cherished his reputation quite much, so he let Shi Guan change his father and brother into a nest of waste, and he was just forced to do so. Emperor Li Shimin also did a very good job, so the people of the world really felt that Li Shimin was forced. We can't look at the ancient emperors with the eyes of ordinary people, but to be like Li Shimin is also quite powerful.