In Chinese history, the struggle for the throne was often accompanied by bloodshed and intrigue. However, in the late Sui Dynasty, a prominent prince Yang Guang did not kill the potential rival Tang Gaozu. This behavior was influenced by complex political and social factors. This article will delve into why Yang Guang did not kill Tang Gaozu.

Firstly, there was a political marriage relationship between Yang Guang and Tang Gaozu. Yang Guang's sister Yang Lihua married Li Shimin, the son of Tang Gaozu Li Yuan. This marriage relationship made both parties become relatives to a certain extent, forming a community of interests. Therefore, to some extent, Yang Guang had no reason to attack Tang Gaozu.

Secondly, there were threats from internal and external hostile forces. In the late Sui Dynasty, internal and external hostile forces constantly threatened the stability of the regime. Under this background, Yang Guang needed to concentrate on resisting external enemies and internal rebellions. At this time, for the potential rival Tang Gaozu, Yang Guang may have believed that maintaining peaceful coexistence was more beneficial.

Thirdly, there was a misjudgment of the situation and strategic mistakes. Yang Guang may have misjudged the strength and ambition of Tang Gaozu. In his eyes, Tang Gaozu was perhaps just a local force, not strong enough to pose a substantial threat to the central government. However, with Tang Gaozu raising troops in Taiyuan against the Sui Dynasty, this misjudgment gradually exposed its serious strategic mistakes.

Fourthly, there was the support of the people and the course of history. In the late Sui Dynasty, the people were generally dissatisfied with the rule of Yang Guang, the Sui Emperor Yangdi. On the other hand, Tang Gaozu gradually rose to power with his political talent and popular support. Under these circumstances, Yang Guang may have realized that it was difficult to defeat Tang Gaozu, and may have further lost the support of the people. Therefore, he chose to wait and see.

In conclusion, the reasons why Yang Guang did not kill Tang Gaozu are multifaceted. Political marriage, threats from internal and external hostile forces, misjudgment of Tang Gaozu's strength, and the support of the people are among the factors that prompted Yang Guang to make this decision. However, this decision ultimately led to the fall of the Sui Dynasty and the rise of the Tang Dynasty, marking an important turning point in Chinese history.

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