Laozi was a legendary philosopher of ancient China. He is best known as the reputed author of the Tao Te Ching and the founder of philosophical Taoism, but he is also revered as a deity in religious Taoism and traditional Chinese religions. He is usually dated to around the 6th century BCE and reckoned a contemporary of Confucius, but some historians contend that he actually lived during the Warring States period of the the 5th or 4th century BCE. A central figure in Chinese culture, Laozi is claimed by both the emperors of the Tang dynasty and modern commonfolk of the Li family as a founder of their lineage. Throughout history, Laozi's work has been embraced by various anti-authoritarian movements.