This didn't happen. Before Li Shimin launched the Xuanwu Gate Revolution, he had moved out of the palace. At that time, he and Li were still in the palace. On the eve of the Xuanwu Gate incident, Li Shimin didn't let the cat out of the bag. Although he had high prestige in the army at that time, he really couldn't put Tang Gaozu under house arrest. In the political contest with Li for the position of prince, in fact, it has been in a passive situation in the later period.

I chose to let Li be with him. On the one hand, he wants to consolidate his power and weaken Li Shimin's henchmen as much as possible. Otherwise, it is extremely unfavorable for the son to be a father. Before the Xuanwumen Incident, Wuji and Fang had advised that if Li was not killed, he would die. In desperation, I knew that my position would be in jeopardy if I didn't start work, so I took the lead and ambushed in the middle of the lake early. When Li passed by, I shot my brother with a bow and arrow.

Think about it, if Li Shimin can really put him under house arrest, then he doesn't have to kill Li at all, because he has the energy to put the emperor under house arrest, and he can completely force Li Rang to leave the position of prince. Why did you kill him? This cannibalism is despised in history, especially after Li Shimin ascended the throne, he tried to downplay the fact of killing his brother. It can be seen that I have extremely complicated feelings about killing Li, perhaps because he didn't want to leave a lasting stigma after a hundred years, but I think Li must feel guilty. After all, he is a biological brother who grew up together, and he turned against each other as an adult because of the struggle for power and profit.

Therefore, when Li Shimin launched Xuanwu Revolution, Tang Gaozu, who was under house arrest, did not exist. Only after the incident did he know that his son was cannibal. Finally, he had no choice but to abdicate and provide for the aged, and gave Li Tang Jiangshan to Li Shimin.