The event of Emperor Yang Jian of the Sui Dynasty abolishing Yang Yong's position as crown prince is a major mystery in Chinese history. The true reasons for this matter are not clear in historical records, and various speculations and interpretations emerge endlessly. However, based on existing historical data and facts, we can explore this issue from several aspects.

Firstly, Yang Yong's personality and behavior may be an important reason for his being deposed. According to the "History of the Sui Dynasty", Yang Yong had a bold and unrestrained personality, behaving in an indulgent and casual manner, which contrasted sharply with the rigorous and thrifty character of Emperor Yang Jian. Yang Yong's personality and behavior may have made Emperor Yang Jian feel dissatisfied and worried that he could not be a qualified monarch.

Secondly, political struggle may also be an important factor. In ancient times, the issue of imperial succession often involved complex political struggles. After Yang Yong was deposed, his younger brother Yang Guang was appointed as the crown prince, which may have been related to the political influence behind Yang Guang. Yang Guang's mother, Dugu Jialuo, was Emperor Yang Jian's queen and had great influence on Yang Guang's appointment as the crown prince.

Moreover, Yang Yong may not have handled his relationship with his father well. According to the "History of the Sui Dynasty", Yang Yong once had disputes with Emperor Yang Jian over minor matters and even physically assaulted him. Such behavior undoubtedly caused Emperor Yang Jian to lose trust and respect for Yang Yong.

Lastly, we cannot ignore the fact that the development of history is often influenced by many unforeseeable factors. The event of Yang Yong's deposition may have also been affected by these factors.

Overall, the true reasons for Emperor Yang Jian of the Sui Dynasty to abolish Yang Yong's position as crown prince may involve various factors such as personality, behavior, political struggle, and parent-child relationship. However, due to the complexity and uncertainty of history, we cannot determine which factor is decisive. This is also the charm of history, which leaves us with endless imagination and exploration space.

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