長孫無忌
Emperor Gaozong's wife and empress Empress Wang did not have a son, and her uncle, the chancellor Liu Shi suggested to her to have Li Zhong made crown prince, hoping that he would be grateful to her. Empress Wang agreed, and Liu Shi subsequently lobbied the other chancellors, including Emperor Gaozong's powerful uncle Zhangsun Wuji, into agreeing to and requesting the same. Emperor Gaozong agreed, and in 652, he created Li Zhong crown prince. The chancellors Yu Zhining, Zhang Xingcheng, and Gao Jifu took on additional titles as the young crown prince's advisors.