Lao-tse, also known as Laozi or Lao Tzu, was an ancient Chinese philosopher and writer who is best known for being the author of the Tao Te Ching. The word "Lao-tse" is a common term used to refer to him and his teachings, but there are several synonyms that are also used. Some of these include "Laozi," "Old Master," "Master Lao," and "Lao Tzu." While these terms all refer to the same person, they offer different perspectives and interpretations of his teachings. Each synonym offers a unique insight into Lao-tse's philosophy, and helps us to better understand his timeless wisdom.