According to the documents provided, there were many reasons why Li Chengqian was deposed as the Crown Prince during the Zhenguan period. First, Li Chengqian had attempted to force the abdication, colluding with Li Yuanchang, the King of Han, Du He, Hou Junji, and the Princess of Chengyang's son-in-law, but his plan had been exposed and he had been deposed. Secondly, Li Chengqian's behavior was indulgent, indulging in wine, sex and entertainment, wasting the country's financial and material resources and losing Tang Gaozong's trust in him. In addition, Li Chengqian's actions were also suspected of rebellion, causing Tang Gaozong to lose trust in him. Thus, Li Chengqian was stripped of his position as Crown Prince.
During the reign of Zhenguan, Li Chengqian was deposed as the crown prince. According to the documents provided, Li Chengqian plotted a coup in the 17th year of Zhenguan and was deposed as a commoner by Emperor Taizong of the Tang Dynasty. This move was to prevent the tragedy of the three brothers, Li Chengqian, Li Tai, and Li Zhi, similar to the incident at the Black Tortoise Sect. In order to protect his three sons, Taizong exiled Li Chengqian to Qianzhou and stripped Li Tai of his title, demoting him to the Duke of Donglai Prefecture. In the end, Taizong made his ninth son, Li Zhi, the Crown Prince, and Li Zhi ascended the throne. As for the specific reason why Li Chengqian's position as Crown Prince was abolished, the documents did not mention it.
During the reign of Zhenguan, Li Chengqian was deposed as the Crown Prince. According to the documents provided, Li Chengqian plotted a coup in the 17th year of Zhenguan and was deposed as a commoner by Emperor Taizong of the Tang Dynasty. This move was to prevent the tragedy of the three brothers, Li Chengqian, Li Tai, and Li Zhi, similar to the incident at the Black Tortoise Sect. In order to protect his three sons, Taizong exiled Li Chengqian to Qianzhou and stripped Li Tai of his title, demoting him to the Duke of Donglai Prefecture. In the end, Taizong made his ninth son, Li Zhi, the Crown Prince, and Li Zhi ascended the throne. As for the specific reason why Li Chengqian's position as Crown Prince was abolished, the documents did not mention it.
During the Zhenguan period, Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin, and was appointed Crown Prince.
The main reason why Prince Li Chengqian was deposed was that he had lost his virtue and participated in the rebellion. His conduct was corrupt, and he lost the trust and love of his father and his subjects. He indulged in wine, sex, and pleasure, wasting the country's financial and material resources. In addition, he also befriended some crafty people, listened to their instigation, and betrayed his father and country. Such behavior made Li Shiming think that he was not suitable to be a qualified heir. Therefore, Li Shimin decided to abolish Li Chengqian's position as Crown Prince.
The main reason why Prince Li Chengqian was deposed was that he had lost his virtue and participated in the rebellion. His conduct was corrupt, and he lost the trust and love of his father and his subjects. He indulged in wine, sex, and pleasure, wasting the country's financial and material resources. In addition, he also befriended some crafty people, listened to their instigation, and betrayed his father and country. He also plotted to assassinate his brothers and ministers, overthrow his father's rule, and seize the throne. Such behavior caused him to lose the qualifications to be the heir and was eventually deposed as the Crown Prince.
The reason why Crown Prince Li Chengqian was deposed was related to the palace coup he had planned. According to historical records, Prince Li Chengqian plotted to force the palace to rebel in the 17th year of Zhenguan, but after the matter was exposed, he was deposed as a commoner and exiled to Qianzhou. This coup might have been because Li Chengqian was worried that his position as Crown Prince would be lost, and Emperor Taizong's other son, Li Tai, was deeply favored by the Emperor, forming a threat to the Crown Prince. Thus, Crown Prince Li Chengqian's coup led to his fate of being deposed as a commoner.
The reason why Crown Prince Li Chengqian was deposed was related to the palace coup he had planned. According to records, during the reign of Emperor Taizong, the fight for the position of Crown Prince was extremely intense. Li Chengqian was Taizong's eldest son, but he was worried that his position as prince would not be guaranteed, so he plotted to force the palace to rebel in the 17th year of Zhenguan. As a result, the matter was exposed, and he was deposed as a commoner and exiled to Qianzhou. The failure of the coup had affected the fate of Li Chengqian and his followers. The epitaph's record of 'the Lord was humiliated before, and the minister was deposed after' may have implied this incident. Although Li Chengqian was deposed, the one who finally ascended the throne was Tang Taizong's ninth son, Li Zhi.
The main reason why Li Chengqian was deposed as the Empress was because of his lack of virtue and his suspicion of rebellion. Li Chengqian's character was corrupt. He indulged in wine, sex, and entertainment, wasting the country's financial and material resources. He lost the trust and love of his father and his subjects. In addition, he also befriended some crafty people and listened to their instigation. Li Chengqian was also suspected of rebellion and attempted to assassinate Li Tai, but failed. These actions made Li Shimin think that Li Chengqian was not suitable to be the monarch, so he abolished Li Chengqian's position as the Crown Prince and exiled him to Qian Prefecture.
Zhenguan Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. It was speculated that he might have a chronic disease related to his family, most likely diabetes. After the progression of diabetes, it would lead to leg disability, which might be one of the reasons for Li Chengqian's disability. In addition, Li Chengqian decided to rebel because of the instability of the Crown Prince's position and fear of being deposed. He tried to assassinate his brother Li Tai, but after the plan was exposed, he was deposed as a commoner and exiled to Qianzhou. After Li Chengqian passed away, he was buried with the etiquette of a duke. As for more details about Li Chengqian, the information provided so far was not enough to draw more conclusions.
There were many reasons why Li Chengqian was deposed as the Crown Prince. First of all, his conduct was corrupt, and he had lost the trust and love of his father and his subjects. He did not obey his father's orders, did not respect his teachers, did not care about political affairs, indulged in wine, sex, and pleasure, wasting the country's financial and material resources. He had also befriended some crafty people and listened to their instigation, betraying his father and country. Secondly, Li Chengqian's rebellion violated his father's bottom line and endangered the country's security and stability. He attempted to assassinate his brothers and ministers, and even wanted to overthrow his father's rule and seize the throne. Such behavior forced Li Shimin to depose his position as Crown Prince and exile him to other places. In general, Li Chengqian's misbehavior and rebellion were the main reasons for his dethronement.