Li Sujie (李素節) (646 – June 24, 690), formally the Prince of Xu (許王), was an imperial prince of the Chinese dynasty Tang Dynasty. He was the fourth son of Emperor Gaozong, born of his one-time favorite Consort Xiao. After Consort Xiao and Emperor Gaozong's wife Empress Wang were deposed and executed due to the machinations of Emperor Gaozong's second wife Empress Wu (later known as Wu Zetian), Li Sujie was under the watchful eyes of Empress Wu, and was several times demoted on accusations of misbehavior. In 690, with Empress Wu serving as empress dowager and regent over her son Emperor Ruizong, she began to massacre Tang imperial clan members in preparation of seizing the throne herself, and she summoned Li Sujie and his older brother Li Shangjin (李上金) to the then-capital Luoyang. When they arrived near Luoyang, Empress Dowager Wu had him strangled, while Li Shangjin committed suicide.
Read more about Li Sujie: Before Consort Xiao's Death, After Consort Xiao's Death, Death, Ancestry