Wu Chengsi
Despite the fact that Wu Zetian created Li Dan crown prince, she considered creating one of her nephews, Wu Chengsi the Prince of Wei or Wu Sansi the Prince of Liang crown prince, and a petition drive for Wu Chengsi to be created crown prince reached its peak in 691. The chancellors Cen Changqian and Ge Fuyuan were even executed for opposing it, but Wu Zetian never did carry out the change, and when the leader of the petition drive, Wang Qingzhi () was caned to death by the official Li Zhaode, the petition drive dissipated.