Shangguan Wan'er
In 710, Emperor Zhongzong died suddenly—a death that traditional historians believed to be a poisoning carried out by Empress Wei and their daughter Li Guo'er the Princess Anle, so Empress Wei could become emperor like Wu Zetian and Li Guo'er could become crown princess. In the meantime, however, Emperor Zhongzong's son by a concubine, Li Chongmao the Prince of Wen was made emperor (as Emperor Shang), with Empress Wei serving as empress dowager and regent. Under a will that Emperor Zhongzong's sister Princess Taiping and concubine Consort Shangguan Wan'er initially drafted, apparently as a compromise, Emperor Zhongzong's brother Li Dan the Prince of Xiang (the former Emperor Ruizong) would have been made coregent, but the plan was opposed by Empress Dowager Wei's cousin Wei Wen and another chancellor, Zong Chuke, and Li Dan was not made coregent.