Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. He played an important role in the prosperous period of the Tang Dynasty. As the Crown Prince, he had received an excellent Confucian education and displayed his intelligence. However, despite Li Chengqian's outstanding talent and ability to govern the country, he eventually embarked on the path of rebellion, was deposed as a commoner, and was demoted to Qian Prefecture. As for why he chose this path, the current information could not provide an answer.

Li Chengqian (619-January 5, 645) was the eldest son of Emperor Taizong of Tang Dynasty, Li Shimin. His ancestral home was Longxi Chengji (now Qin 'an County, Gansu Province). He was born in the second year of the Great Tang's founding and was conferred the title of King Heng Shan. Later, he was conferred the title of King Sun Yat-sen. Li Chengqian had been taught by many excellent teachers, including Kong Yingda, Lu Mingde, and other famous officials and scholars. He was appointed Crown Prince by Li Shimin, which showed that he had been in contact with government affairs earlier than the other princes. However, Li Chengqian's destiny was not smooth. Due to his leg disease, he was unable to move, and his personality gradually became arrogant and disrespectful. After his attempt to assassinate Li Tai failed, he plotted with others. After the matter was exposed, he was deposed as a commoner and exiled to Qian Prefecture. After Li Chengqian's death, his grandson Li Shizhi became prime minister and posthumously gave him the title of Jingzhou Grand Governor, Hengshan Prince, and posthumous title of Min.
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 was conferred the title of King Heng Shan, and later, he was conferred the title of Prince of Zhongshan. Li Shimin attached great importance to cultivating Li Chengqian's ability to govern the country, allowing him to come into contact with government affairs and hearing lawsuits. Li Chengqian was described as intelligent and kind, and was loved and appreciated by Li Shimin. However, the information given about Li Chengqian's specific fate and achievements was not enough to provide an answer.
The Great Tang's Prosperous Age, Chengqian, was a novel written by Teng Xiuqi. This novel told the story of Li Chengqian, the crown prince of the Tang Empire. Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. When he was young, he was granted the title of King Hengshan and received the teachings of famous Confucian masters such as Lu Deming and Kong Yingda. As time passed, Li Shiming paid more and more attention to Li Chengqian's talent and contribution, and finally decided to pass the throne to him. This novel described Li Chengqian's growth and responsibilities in the prosperous Tang Dynasty.
The Great Tang's Prosperous Age, Chengqian, was a novel written by Teng Xiuqi. This novel told the story of Li Chengqian, the crown prince of the Tang Empire. Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. When he was young, he was granted the title of King Hengshan and received the teachings of famous Confucian masters such as Lu Deming and Kong Yingda. As time passed, Li Shimin paid more and more attention to cultivating Li Chengqian. In 630 AD, Li Chengqian began to participate in government affairs when he was only 12 years old. However, other than that, the search results did not provide any information about the specific plot or content of the novel. Therefore, I am unable to provide any more information regarding the details and storyline of the Great Tang's Prosperous Chengqian.
We know that " The Rebirth of the Crown Prince of the Tang Dynasty, Li Chengqian " is a novel. It tells the story of a modern otaku who traveled to the 17th year of Zhenguan in the Tang Dynasty and became the Crown Prince, Li Chengqian. Crown Prince Li Chengqian was facing the crisis of deposing the Crown Prince. The people around him also had ulterior motives and constantly encouraged him to rebel. Crown Prince Li Chengqian had to think of a way to escape from this dangerous situation. However, other than that, the search results provided did not provide any more details or content about the plot of " The Rebirth of Li Chengqian, the Crown Prince of the Tang Empire ". Therefore, we have no way of knowing the specific plot and development of this novel.
Li Chengqian (619 - 645 January 5) was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. He was born in Chengji, Longxi (now Qin 'an County, Gansu Province). As a minister of the imperial clan of the Tang Dynasty, Li Chengqian was granted the title of Prince of Zhongshan. When he was young, he had shown his intelligence and was appointed as the crown prince by Emperor Taizong of the Tang Dynasty. Li Chengqian was doted on by his father and received guidance from Lu Deming, Kong Yingda, Wei Zheng, and other famous officials. However, as he grew older, Li Chengqian became rebellious and misbehaved. He was criticized by the ministers. After his attempt to assassinate Li Tai failed, he plotted with others. After the matter was exposed, he was deposed as a commoner and exiled to Qian Prefecture. Finally, Li Chengqian died of depression in the 19th year of Zhenguan and was buried with the etiquette of the state.
We can draw the following conclusions: The first chapter is about the Tang Crown Prince Li Chengqian.
Li Chengqian (619-January 5, 645), also known as Gaoming, was the eldest son of Emperor Taizong of Tang Dynasty, Li Shimin. His mother was Empress Wende's grandson. He was born in Longxi, Gansu Province (now Qin 'an County, Gansu Province). After being granted the title of King of Hengshan Prefecture, he was changed to Prince of Zhongshan. Li Chengqian was named Crown Prince after Emperor Taizong ascended the throne and was described as intelligent and benevolent. He had been conferred the titles of Prince Heng Shan and Prince Sun Yat-sen, and had received special attention from Taizong, who had praised him as a talented son. However, as he grew older, his behavior became rebellious, causing criticism from the ministers. According to historical records, he had once sent assassins to assassinate his teacher and had a tense relationship with his younger brother, Li Tai. He had also planned to launch a coup against the Black Tortoise Sect, but it had failed because of a leak from his servant. Li Chengqian died at the age of 27. The cause of his death was unknown. As for his life and personal information, the information provided was limited and could not provide more detailed information.
" The Rebirth of the Tang Crown Prince Li Chengqian " was a time-travel novel. It told the story of a modern otaku who traveled to the 17th year of Zhenguan in the Tang Dynasty and became the Crown Prince Li Chengqian. Crown Prince Li Chengqian was facing the crisis of deposing the Crown Prince. The people around him also had ulterior motives and constantly encouraged him to rebel. However, the search results did not provide any information on the specific plot and story development, as well as Li Chengqian's final fate. Therefore, I don't know the exact content and ending of 'The Rebirth of the Crown Prince of the Great Tang, Li Chengqian'.
The Rebirth of the Tang Crown Prince Li Chengqian was a time-traveling novel. It told the story of a modern otaku who traveled to the 17th year of Zhenguan in the Tang Dynasty and became the Crown Prince Li Chengqian. Crown Prince Li Chengqian was facing the crisis of deposing the Crown Prince. The people around him also had ulterior motives and constantly encouraged him to rebel. However, the search results did not provide any detailed information about the plot and story development, as well as Li Chengqian's final fate.