Wu Chengsi
In 690, Empress Dowager Wu had Emperor Ruizong yield the throne to her, and she took the throne as "emperor," establishing a new Zhou Dynasty and interrupting Tang. She created a number of her Wu clan relatives imperial princes, and Wu Sansi was created the Prince of Liang and made the minister of civil service affairs (, "Tianguan Shangshu"). He did not appear to have as much power as Wu Chengsi (who became chancellor), but was nevertheless honored. For example, in 693, when Wu Zetian made sacrifices to heaven and earth, she offered the sacrifices herself first, followed by Wu Chengsi, and then Wu Sansi. It was said that he had done some studies in literature and history and was good at flattery. As the years went by, he often flattered Wu Zetian's successive lovers Huaiyi, Zhang Yizhi, and Zhang Changzong.