Critias (460 - 403 BC) was an ancient Athenian political figure and author. Born in Athens, Critias was the son of Callaeschrus and a first cousin of Plato's mother Perictione. He became a leading and violent member of the Thirty Tyrants. He also was an associate of Socrates, a fact that did not endear Socrates to the Athenian public.Critias was noted in his day for his tragedies, elegies and prose works. Some, like Sextus Empiricus, believe that Critias wrote the Sisyphus fragment; others, however, attribute it to Euripides. His only known play is Peirithous, of which only a single 42-line fragment survives (Sextus Empir. p. 403, 1). In addition, eight shorter quotations from unidentified plays have come down to us.