The Tao Te Ching is a Chinese classic text, which, according to tradition, was written around 6th century BC by the sage Laozi (or Lao Tzu, "Old Master"). The text's true authorship and date of composition or compilation are still debated, although the oldest excavated text dates back to the late 4th century BC. The text is fundamental to both philosophical and religious Taoism and strongly influenced other schools, such as Legalism, Confucianism and Chinese Buddhism, which when first introduced into China was largely interpreted through the use of Daoist words and concepts.