Laozi (Chinese: 老子; pinyin: Lǎozǐ; Wade–Giles: Lao Tzu; also romanized as Lao Tse, Lao Tu, Lao-Tsu, Laotze, Laosi, Laocius, and other variations) was a philosopher of ancient China, best known as the author of the Tao Te Ching (often simply referred to as Laozi). His association with the Tao Te Ching has led him to be traditionally considered the founder of philosophical Taoism (pronounced as "Daoism"). He is also revered as a deity in most religious forms of Taoist philosophy, which often refers to Laozi as Taishang Laojun, or "One of the Three Pure Ones".
Laozi is an honorific title. Lao (老) means "venerable" or "old", such as modern Mandarin laoshi (老师), "teacher". Zi (子), Wade-Giles transliteration tzu, in this context is typically translated "master". Zi was used in ancient China as an honorific suffix, indicating "Master", or "Sir". In popular biographies, Laozi's given name was Er, his surname was Li (forming Li Er, 李耳) and his courtesy name was Boyang. Dan is a posthumous name given to Laozi, and he is sometimes referred to as Li Dan (李聃).
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