There were several speculations about Li Chengqian's foot disease. The first speculation was that Li Chengqian's foot disease was hereditary. It might be caused by a family hereditary Qi disease, which might include respiratory and cardiovascular diseases such as dizziness, asthma, and diabetes. The second speculation was that Li Chengqian's foot disease was caused by an acquired illness. There were records that Li Chengqian had a serious illness in the fifth and seventh years of Zhenguan. It was possible that his legs were not good at that time. The third speculation was that Li Chengqian's foot injury was caused by falling off a horse. However, these speculations were not supported by conclusive evidence, so it was impossible to determine the specific cause of Li Chengqian's foot disease.

Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. He was born in 619 AD. His name was given by Tang Gaozu Li Yuan. Because he was born in Chengqian Hall, he was named Li Chengqian. Li Chengqian was conferred the title of King Heng Shan when he was young, and later on, he was conferred the title of Sun Yat-sen King. He was smart and kind-hearted, and was favored and valued by Li Shimin. In order to cultivate his ability, Li Shimin arranged for two Confucian masters, Lu Deming and Kong Yingda, to teach him. However, Li Chengqian had some problems during his growth. He was jealous of his younger brother, Li Tai, and tried to launch a coup against the Black Tortoise Sect, but he failed in the end. In order to protect Li Chengqian, Li Shimin decided to make Li Zhi the Crown Prince and sent Li Chengqian to Qian Prefecture. Li Chengqian died in the 19th year of Zhenguan (645). He was posthumously presented as King Hengshan and Governor of Jingzhou. He was buried in Zhenguan Mausoleum with the etiquette of Duke of the State. As for the reason for Li Chengqian's limp and his role in the TV series "Celebrating Years," there was no mention of it in the current search results.
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Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. His mother was Empress Wende, Empress Zhangsun. Li Chengqian was granted the title of Prince of Zhongshan, and later, after Taizong ascended the throne, he was named Crown Prince. He had an affair with the Eldest Princess Li Yunrui, but it was eventually discovered by the Qing Emperor and he was stripped of his position as Crown Prince. The search results did not provide clear information about the specific details of their affair. In addition, Li Chengqian also had a male pet named Chenxin, but there was no detailed record of Chenxin's identity.
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 (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, surnamed Zhangsun. During the reign of Emperor Wude, he was conferred the title of Prince of Zhongshan and the crown prince. Li Chengqian was intelligent and kind-hearted, and was favored and valued by Taizong. However, due to his leg disease, he was unable to move. He did not take his father's advice seriously and even sent assassins to assassinate his teacher. He had a tense relationship with his younger brother, Li Tai, and the two of them fought for the position of eldest son. In the 16th year of Zhenguan (642), after Li Chengqian failed to assassinate Li Tai, he colluded with others to plot evil, but the plan was exposed. Under Taizong's protection, Li Chengqian was deposed as a commoner and exiled to Qianzhou. After his death, he was buried with the etiquette of a duke.
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.
Li Chengqian's descendants included Li Xiang, Li Yi, Li Jue, and Li Shizhi. Among them, Li Shizhi was Li Chengqian's most outstanding grandson. He became prime minister during the reign of Emperor Xuanzong of the Tang Dynasty. Most of Li Chengqian's descendants were officials in the court, but their positions were not big. Only Li Shi's position was the biggest, and he became prime minister during the reign of Emperor Xuanzong of Tang Dynasty. There was no information on the specific situation and achievements of the other descendants.