Why does Zhangsun Wuji not like Li Chengqian?

Zhangsun Wuji and Li Chengqian were in-laws. Zhangsun Wuji was Li Chengqian's biological nephew because Zhangsun Wuji's son married Li Chengqian's Crown Prince's younger sister. In the early Zhenguan period, Zhangsun Wuji was loyal to the emperor and did not show any special relationship with any prince, so he was not implicated in Li Chengqian's rebellion.

Empress Zhangsun was the empress of Emperor Taizong of the Tang Dynasty, Li Shimin, and also Li Chengqian's mother. She was the daughter of the Sui Dynasty's General Zhangsun Sheng and the younger sister of the Tang Dynasty's Prime Minister Zhangsun Wuji. Empress Zhangsun was chased out of the house after her father's death and was later adopted by her uncle. Uncle loved her very much and hoped that she would marry a good husband. Therefore, after Empress Zhangsun's father's funeral, her uncle betrothed her to Li Shimin. After Empress Zhangsun married Li Shimin, she had been well-behaved and helped Li Shimin achieve many things. After Li Shimin ascended the throne, he conferred Empress Zhangsun the title of Empress and treated her with great respect and love. Empress Zhangsun had strict requirements for Crown Prince Li Chengqian, hoping that he could establish virtue and spread a good reputation. As the crown prince, Li Chengqian was the center of attention, but he became absurd after he became an adult. He liked sensual pleasures and lived a luxurious life. In the end, Li Chengqian was deposed as a commoner for plotting a rebellion and was exiled to Qianzhou, where he died two years later.

Empress Zhangsun was the empress of Emperor Taizong of the Tang Dynasty, Li Shimin, and Li Chengqian was their eldest son. Empress Zhangsun gave birth to three sons, namely Li Chengqian, Li Tai, and Tang Gaozong Li Zhi. Li Chengqian grew up under the favor of Emperor Taizong of Tang Dynasty and was made the crown prince. However, after Empress Zhangsun's death, Li Chengqian became absurd, indulged his own desires, and even rebelled. Finally, he was deposed. As for the specific situation of Empress Zhangsun and Li Chengqian, the search results did not provide a definite answer.

Li Shimin liked Li Chengqian. Li Shiming was very fond of Li Chengqian and had made him the Crown Prince from a young age. He had invited many great teachers to teach him and spared no effort in nurturing him, placing the future of the Great Tang on his shoulders. Li Chengqian was also very outstanding in his early years and was deeply loved by Li Shimin. Li Shimin attached great importance to Li Chengqian's education and sent Confucian masters Kong Yingda, Lu Deming, and others to teach him Confucian classics. Li Chengqian performed well in government affairs and handled state affairs in an orderly manner. He was trusted and loved by Li Shimin. However, as he grew older, Li Chengqian suffered from foot disease and became disheartened. He began to rebel and was eventually deposed as a commoner. Thus, although Li Shi Min liked Li Chengqian, due to some reasons, he eventually abolished Li Chengqian's position as Crown Prince.

During the Zhenguan period, the relationship between Li Chengqian and Zhangsun Chong was not clearly answered in the search results provided. Therefore, I do not know the specific situation between Li Chengqian and Zhangsun Chong during the Zhenguan period.

Yes, Li Chengqian was the eldest son of Empress Zhangsun.

Yes, Li Chengqian was Empress Zhangsun's son.

Yes, Li Chengqian was the son of Empress Zhangsun.

Yes, Li Chengqian was the eldest son of Emperor Taizong and Empress Zhangsun.

Zhenguan Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin, and Zhangsun Chong was the son of Zhangsun Wuji. They had no direct relationship with Zhenguan Li Chengqian.