(429-348 BCE) Athenian philosopher, student of Socrates, associated with the mysticism of Pythagoras. Known for his philosophy on the concept of forms, which may have influenced Gnostic thought in regard to the concept of forms, and the nature of the soul. A partial copy of "Plato's Republic", is contained in the Nag Hammadi Library. http://wsu.edu/~dee/GREECE/PLATO.HTM