Li Sujie (李素節) (646 – 690-692), formally the Prince of Xu (許王), was an imperial prince of the Chinese 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 false accusations of misbehavior, In particular, as Emperor Gaozong's health deteriorated and government affairs fell to Empress Wu, Li's grief increased. During the Tianshou era, with Wu finally establishing her own dynasty, she continued to massacre Tang imperial clan members as she perceived them as threats, 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. Before Consort Xiao's death Li Sujie was born in 646, when his father Li Zhi was crown prince under his grandfather Emperor Taizong. He was Li Zhi's fourth son, and he was born of Li Zhi's then-favorite concubine, Consort Xiao. After Emperor Taizong's death in 649, Li Zhi succeeded him (as Emperor Gaozong), and in 651 created Li Sujie the Prince of Yong and gave him titularly the important post of prefect of the capital prefecture, Yong Prefecture (雍州, roughly modern Xi'an, Shaanxi). It was said that Li Sujie could recite 500-word ancient poems and was studious in studying under the scholar Xu Qidan (徐齊聃). He was said to be much loved by Emperor Gaozong. When he grew older, he was made the prefect of Qi Prefecture (岐州, roughly modern Baoji, Shaanxi). Meanwhile, Li Sujie's mother Consort Xiao was locked in a fierce battle with Consort Wu (later known as Wu Zetian) for the affections of Emperor Gaozong, in which she allied herself with the emperor's primary wife Empress Wang. In 655, Consort Wu accused Empress Wang and her mother Lady Liu (sister of Liu Shi) of engaging in witchcraft; in response, Emperor Gaozong deposed and imprisoned not only Empress Wang, but also Consort Xiao, on 16 November, replacing Empress Wang with Consort Wu. Soon thereafter (within the same lunar month of their deposition), the deposed Empress Wang and Consort Xiao were executed on Empress Wu's orders. After Consort Xiao's death