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Remembered as the legendary gatekeeper who asked Laozi to write before leaving China, this ancient Chinese figure is traditionally linked to one of the classic texts of Daoism. His story sits at the crossroads of philosophy, myth, and early Chinese religious tradition.

by active 6th century B.C. Xi Yin
Traditionally known as Yinxi (also rendered Xi Yin or Yin Hsi), he is a legendary figure from Zhou-era China who later became closely associated with the Daoist text Guanyinzi. He is often described as the guardian of a western pass who recognized Laozi as a great sage and urged him to record his teachings before departing.
Because the sources about him are ancient and legendary, very little can be confirmed as straightforward biography in the modern sense. Later tradition treats him as an important early Daoist figure, and paintings and retellings often present him as a wise seeker or transcendental adept rather than simply a historical official.
For readers today, he is best understood as a figure of cultural memory: part philosopher, part legend, and part literary attribution. That mix of history and myth is part of what makes works connected with his name so enduring.