Wangcheng (Zhou dynasty) in the context of Ancient Chinese urban planning

Laozi (/ˌlaʊˈtsʌ/ low-TSUH; Chinese: 老子; pinyin: Lǎozǐ) was a legendary Chinese philosopher considered to be the author of the Tao Te Ching (Laozi), one of the foundational texts of Taoism. The name, literally meaning 'Old Master', was likely intended to portray an archaic anonymity that could converse with Confucianism. Modern scholarship generally regards his biographical details as later inventions and his opus a collaboration of various writers. Traditional accounts addend him as Li Er, born in the 6th-century BC state of Chu during China's Spring and Autumn period (c. 770 – c. 481 BC). Serving as the royal archivist for the Zhou court at Wangcheng (modern Luoyang), he met and impressed Confucius (c. 551 – c. 479 BC) on one occasion, composing the Tao Te Ching in a single session before retiring into the western wilderness.

A central figure in Chinese culture, Laozi is generally considered the founder of Taoism. He was claimed and revered as the ancestor of the Tang dynasty (618–907) and is similarly honored in modern China as the progenitor of the popular surname Li. In some sects of Taoism, Chinese Buddhism, Confucianism, and Chinese folk religion, it is held that he then became an immortal hermit. Certain Taoist devotees held that the Tao Te Ching was the avatar – embodied as a book – of the god Laojun, one of the Three Pure Ones of the Taoist pantheon, though few philosophers believe this.