During the reign of Zhenguan, there were many reasons for Li Chengqian's rebellion. First of all, Li Shimin had high expectations for Li Chengqian. After the incident at Xuanwu Gate, he became the Crown Prince of the Tang Dynasty. As the eldest son, Li Chengqian naturally became the Crown Prince. However, Li Chengqian was worried that his position as Crown Prince was unstable and might be deposed, so he decided to take the risk. In addition, Li Chengqian had shown extraordinary talent at a young age and was valued and loved by Li Shimin. However, Li Chengqian's rebellion plan ultimately failed, and he was deposed as a civilian and exiled. The details and outcome of Li Chengqian's rebellion were not mentioned in the documents.

Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. He favored a person named "Chenxin", who was a very happy person. However, when Emperor Taizong heard about this, he was very angry and killed Chenxin. Li Chengqian was very sad about this. In order to commemorate his dead male pet, he set up a room for him in the palace and let the palace people pay homage to him day and night. In addition, Li Chengqian also erected a monument for Chenxin's grave and gave him an official position. He often cried for him. There was no clear information about Chenxin's gender in the search results. Therefore, regarding the specific situation of Li Chengqian and Chenxin during the Zhenguan reign, the search results did not provide a definite answer.
During the reign of Zhenguan, a series of events happened to Li Chengqian. Li Chengqian was accused of rebellion in the 17th year of Zhenguan and was arrested. During the trial, Li Shimin had considered deposing the Crown Prince, but in the end, he decided not to execute Li Chengqian, but to exile him. The search results did not provide clear information on the specific reasons for Li Chengqian's rebellion. Therefore, the details of Li Chengqian's incident were currently unknown.
During the reign of Zhenguan, a series of events happened to Li Chengqian. According to the search results, Li Chengqian was accused of rebellion in the 17th year of Zhenguan and arrested. During the trial, Li Shimin had considered deposing the Crown Prince, but in the end, he decided not to execute Li Chengqian, but to exile him. However, the search results did not provide clear information on the specific reasons for Li Chengqian's rebellion. Therefore, the details of Li Chengqian's incident in Zhenguan were currently unknown.
We can conclude that during the Zhenguan period, there was indeed a quarrel between Li Chengqian and Li Shimin. According to the first document, Li Chengqian felt the pressure from Li Shimin and Li Tai. The second document mentioned that Li Tai had once threatened Li Zhi behind his back, but Li Zhi had reported him. The third document described Li Chengqian angrily expressing his unwillingness to be the Crown Prince in Taiji Palace. From then on, there was no Crown Prince in Zhenguan. The fourth document mentioned that Li Shimin decided to make Li Chengqian the Crown Prince, but he was so angry that he fell ill. Combining all this information, it could be concluded that during the Zhenguan period, there was indeed a quarrel between Li Chengqian and Li Shimin.
Zhenguan governance Li Chengqian rebellion is in the 33rd episode.
Li Chengqian rebelled because he felt threatened by being deposed, so he secretly roped in some people and planned to launch a coup. However, his plan was leaked, Crown Prince Li Chengqian was deposed, and someone reported his involvement in the rebellion. In the end, Li Chengqian was demoted to a commoner and exiled to the border. He died of illness in the place of exile. His rebellion led to civil strife and chaos in the Tang Dynasty, causing huge losses and impacts on the country and the imperial court. Li Chengqian rebelled because he felt that he was being neglected and distrustful by his father, Li Shimin, and the conflict between him and Li Shimin.
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.
The result of Li Chengqian's rebellion was that he was demoted to a commoner and exiled to Qianzhou. In 644 AD, Li Chengqian died in exile. Emperor Taizong of the Tang Dynasty, Li Shimin, stopped the court for a few days and buried him according to the etiquette of the Duke of the State.
Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. He was born in 619. When he was young, he showed a clever and lovely talent, and was loved and valued by Emperor Taizong of the Tang Dynasty. Li Chengqian was made Crown Prince at the age of eight and enjoyed supreme glory and power. However, as time passed, his personality and mentality changed. He became extravagant, wanton, and had the idea of usurping the throne. Li Chengqian's dissatisfaction and fear towards Li Shiming became the direct cause of his rebellion. He was dissatisfied with Li Shiming for executing his pet boy and others, and also dissatisfied with Li Shiming's teachings and discipline. He was afraid that Li Shi Min would depose him or let his brother Li Tai inherit the throne. He was also afraid that Li Shiming would discover his misdeeds or expose his rebellion plan. Therefore, he decided to strike first and seize the throne to become the Son of Heaven. Li Chengqian's rebellion failed in the end and he was deposed as a commoner by Li Shimin. As for the root cause of Li Chengqian's rebellion, other than the direct reason, it also included the fact that his position as Crown Prince was too early and too long, as well as the changes in his psychology and personality.
There were many reasons for Li Chengqian's rebellion. On the surface, his dissatisfaction and fear towards Li Shi Min was the direct reason. He was dissatisfied with Li Shiming for executing his pet boy and others, and also dissatisfied with Li Shiming's teachings and discipline. He was afraid that Li Shi Min would depose him or let his brother Li Tai inherit the throne. He was also afraid that Li Shiming would discover his misdeeds or expose his rebellion plan. However, from a deeper perspective, the root cause of Li Chengqian's rebellion was the change in his personality and psychology. He had changed from a clever, cute, filial, and understanding Crown Prince to a dissolute, wanton, and delusional traitor. This change might be due to him being made Crown Prince too early, enjoying supreme glory and power, as well as the deterioration of his relationship with his father and the competition between his brothers. The leak of the rebellion plan, the lack of supporters, and the lack of military strength also led to the failure of the rebellion. Regarding the outcome of Li Chengqian's rebellion, there was no clear answer based on the given information.