Li He is a half-brother, and their mothers are both Dou Baosui with Xianbei descent. Although the relationship with the brothers was particularly harmonious before the war, after the war, the distance between Li and Li gradually widened, and some contradictions also occurred between the brothers. In the early Tang Dynasty, Li Yuan needed to quickly identify an heir to the throne. As the eldest son and youngest son, Li deserved to be the Crown Prince. Because the crown prince needs to be in Beijing, he lost many opportunities to make contributions.
Although Li Shimin was often in danger and needed to fight the enemy, he also made many meritorious deeds and won more and more prestige in the army. Later, a minister around Li saw the clue of the matter. He suggested to Li that his reputation was very high and the whole world admired him. On the other hand, the prince often enjoys a luxurious life in the palace. In the long run, the prince will definitely lose the right to inherit the throne.
Li listened to the words of his recent minister and began to lead the troops to fight, but at that time, world events were decided and only a relatively small separatist force had not been eliminated. Even if Li wiped out that man, his military achievements could not be compared. Compared with the two brothers Li, his advantage is that he is the eldest son, which is a unique prerequisite for inheriting the throne. However, as the second son, Li Shimin has made many contributions and enjoys high prestige. Because of this, Li Shimin was able to successfully launch the change of Xuanwu Gate. Without this coup, perhaps Li Shimin could only be a courtier to help his brother.