Li Hong
In 655, Empress Wang, due to false accusations of murder and witchcraft by Emperor Gaozong's concubine Consort Wu (later known as Wu Zetian), was deposed, and Consort Wu was created empress to replace her. Empress Wu had two sons of her own by this point, and the oldest, Li Hong, was three years old. Empress Wu's ally, the official Xu Jingzong, submitted a petition arguing that it should be the empress' son who is made crown prince. Emperor Gaozong agreed, and in spring 656, Li Zhong was deposed and reduced to the title of Prince of Liang. He was further removed from the capital, to serve as the prefect of Liang Prefecture (梁州, roughly modern Hanzhong, Shaanxi). Li Hong was created crown prince in his stead.