Li Chéngqián (李承乾) (618 – January 5, 645), courtesy name Gaoming (高明), formally Prince Min of Hengshan (恆山愍王), was a crown prince of the Chinese Tang Dynasty. He was Emperor Taizong`s oldest son and first crown prince, but was replaced later by his younger brother Li Zhi (the eventual Emperor Gaozong). Li Chengqian was creat....