Li Tai

Li Tai (Chinese: 李泰; pinyin: Lǐ Tài; 618 – December 15, 652), courtesy name Huibao (惠褒), nickname Qingque (青雀), formally Prince Gong of Pu (濮恭王), was an imperial prince of the Chinese Tang Dynasty.

Li Tai, who carried the title of Prince of Wei, was favored by his father, Emperor Taizong, for his literary talent and studiousness. His older brother Li Chengqian was crown prince, but Li Tai and his associates had design on that position, eventually pushing Li Chengqian to plot treason in 643. After Li Chengqian's plot was discovered, Li Chengqian was deposed, and Emperor Taizong agreed to create Li Tai the new crown prince. However, Emperor Taizong soon saw that Li Tai had pushed Li Chengqian toward rebellion by machination and further appeared to bear ill intentions toward their younger brother Li Zhi the Prince of Jin, and so Emperor Taizong created Li Zhi crown prince instead. Li Tai was reduced in rank and briefly put under house arrest, and then exiled. He died in exile in 652.

The Buddhist statues in the Main Wall of Bingyang South Cave of the Longmen Caves was dedicated by Li Tai to his deceased mother Empress Zhangsun.

Li Tai was the fourth son of Li Shimin, then the Prince of Qin under his father Emperor Gaozu of Tang. His mother was Li Shimin's wife Princess Zhangsun, who had given birth to his older brother Li Chengqian previously and would have one other son later (Li Zhi) and three daughters (the future Princess Changle, Jinyang, and Xincheng). In 620, he was created the Prince of Yidu, at the same time that Li Chengqian and another older brother, Li Ke (by Li Shimin's concubine Consort Yang (a daughter of Emperor Yang of Sui)) were also created princes. In 621, he was created the Prince of Wei (衛, different than his later title of 魏) and posthumously adopted into the line of his uncle Li Xuanba (李玄霸), who had died early without issue.

...
Wikipedia