Wu Zetian, Empress Regnant of the Zhou Dynasty.

Wu Zetian ( 624-705), 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. As de facto ruler of China first through her husband and her sons from 665 to 690, not unprecedented in Chinese history, she then broke all precedents when she founded her own dynasty in 690, the Zhou (interrupting the Tang Dynasty), and ruled personally under the name Sacred and Divine Empress Regnant and variations thereof from 690 to 705. Her rise and reign has been criticized harshly by Confucian historians but has been viewed under a different light since 1949. (Photo by: Pictures From History/Universal Images Group via Getty Images)