China: Wu Zetian (Empress Wu), 624-705, Empress Regnant of the Zhou Dynasty (r.690-705)

Wu Zetian (17 February 624-16 December 705), personal name Wu Zhao, often referred to as Tian Hou during the Tang Dynasty and Empress Consort Wu in later times, was the only woman in the history of China to assume the title of Empress Regnant. She was de facto ruler of China first through her husband the Emperor Gaozong and then through her sons the Emperors Zhongzong and Ruizong from 665 to 690. She then broke all precedents when she founded her own dynasty in 690, the Zhou (briefly interrupting the Tang Dynasty), and ruled personally under the name Sacred and Divine Empress Regnant from 690 to 705. Her rise and reign has been criticized harshly by Confucian historians but has been viewed in a different light after the 1950s.