Wu Sansi

Wu Sansi (武三思) (died August 7, 707), formally Prince Xuan of Liang (梁宣王), was an official of the Chinese dynasty Tang Dynasty and his aunt Wu Zetian's Zhou Dynasty, becoming an imperial prince and chancellor during the reign of Wu Zetian and subsequently, while only briefly chancellor during the second reign of Wu Zetian's son and his cousin Emperor Zhongzong, becoming very powerful due to both the trust Emperor Zhongzong had in him and his affair with Emperor Zhongzong's powerful wife Empress Wei. He was killed in a rebellion by Emperor Zhongzong's son Li Chongjun the Crown Prince in 707.

Read more about Wu Sansi:  Background, During Emperor Zhongzong's and Emperor Ruizong's First Reigns, During Wu Zetian's Reign, During Emperor Zhongzong's Second Reign