Song Jing
Initially, Princess Taiping agreed to Li Longji's ascension as crown prince despite the fact that Li Longji was not Emperor Ruizong's oldest son and was not born of Emperor Ruizong's wife, the deceased Empress Liu (Li Chengqi was both — and therefore pursuant to Confucian principles of succession should have been crown prince, although Li Chengqi himself declined the title, reasoning that Li Longji's accomplishment was what allowed the empire to be secure), as she believed that Li Longji was young (25 at the time he was made crown prince) and would be easy to control. However, once she began to see that Li Longji was strong-willed, she became apprehensive and often had officials close to her publicly opine that Li Longji was an improper crown prince. She further often paid Li Longji's staff members to spy on him to try to find faults with him. She associated with a group of officials, including the chancellors Dou Huaizhen, Xiao Zhizhong, and Cen Xi, intending to find some way to remove Li Longji, but was unable to get two other chancellors — Wei Anshi and Song Jing — to join her group.