Plato (c428-c348 BC), Ancient Greek philosopher. Plato was a student of Socrates and teacher of Aristotle. His most famous work is The Republic, in which he outlines his vision of an ideal state. Plato founded the Academy in Athens, one of the earliest known organised institutions of learning in Western civilization. Engraving after an antique gem. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)
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