Socrates is one of the most influential, and also most enigmatic, figures in Western Philosophy. An Athenian who lived at the dawn of both writing and philosophy, if he wrote anything himself it has not survived, and today he is known only for the works of others that mention him. Foremost among these are the works of his student, Plato, similarly influential in philosophy, but also prone to idealize his master.
Socrates was particularly noted for his contributions to the field of ethics, and for his creation of the Socratic Method, a philosophical tool no less useful today than it was 25 centuries ago. He was also, if the writings about him are to be believed, a great fan of irony. He was, of course, executed for heresy, although his trial and death appear to have been the result of political infighting, and thus the charge may not accurately reflect the true reasons for his downfall.