Pien Chi'ao [Bian Que] - The most ancient of the physicians from the historical period (ca. 500 B.C.). He was reputed to be an excellent diagnostician, excelling in pulse taking and acupuncture therapy.
He is ascribed the authorship of Bian Que Neijing (Internal Classic of Bian Que). Han Dynasty physicians claimed to have studied his works, which have since been lost.