In the ancient history of China, the rivalry between the sons of Li Yuan, the founder of the Tang Dynasty, is a dramatic story. Among them, why did only three sons fight the hardest? Why did they rebel? This article will attempt to answer these questions.

First, let's learn about Li Yuan's sons. Li Yuan had four sons: Li Jiancheng, Li Shimin, Li Yuanji, and Li Yuanying. Among them, Li Jiancheng was the eldest son, Li Shimin was the second son, and Li Yuanji and Li Yuanying were the third and fourth sons. Among these four sons, the rivalry between Li Jiancheng, Li Shimin, and Li Yuanji was the most intense.

So, why did only these three sons fight the hardest? This is mainly due to their competition for the throne. As Li Yuan's sons, they all had the potential to inherit the throne. However, there was only one throne, which led to competition and struggles among them. In this process, Li Jiancheng, Li Shimin, and Li Yuanji all showed strong ambition and determination, so their rivalry was the most intense.

Next, let's examine why they rebelled. First, Li Jiancheng, as the eldest son, believed that he had the most right to inherit the throne. However, Li Shimin's military talent and reputation made him Li Jiancheng's greatest threat. To protect his position, Li Jiancheng decided to take the initiative and launched the Xuanwumen Rebellion. However, this coup ultimately failed, and Li Jiancheng was executed.

Secondly, after the Xuanwumen Rebellion, Li Shimin became the new crown prince. However, Li Yuanji was not satisfied with this result, as he believed that he also had the qualifications to inherit the throne. Therefore, he united some forces that opposed Li Shimin and launched the second Xuanwumen Rebellion. However, this coup also failed, and Li Yuanji was forced to commit suicide.

Finally, although Li Yuanying was also a son of Li Yuan, he did not participate in this rivalry. This may be because of his gentle nature or because he realized the cruelty and danger of this rivalry.

In general, the rivalry between Li Yuan's sons was mainly due to their competition for the throne. In this process, the rivalry between Li Jiancheng, Li Shimin, and Li Yuanji was the most intense. Their ambition and determination made them strive for the throne at all costs, which also led to their rebellion. However, this rivalry ultimately ended with Li Shimin's victory, and he successfully inherited the throne, becoming the second emperor of the Tang Dynasty.

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