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Main city of Megaris, a district between the Saronic Gulf and the Gulf of Corinth, not far from Athens (area 3).
Megara was the birthplace and home city of Euclid, a philosopher disciple of Socrates and friend of Plato (not to be confused with the geometer author of the Elements, who lived about two centuries later, in the IIIrd century B. C.), whose school of though, largely focused on dialectic, logic and questions about language, took, as a result, the name of "Megarian". It is probably in Megara at Euclid's place that Plato fled after Socrates' execution and lived for a few years before returning to Athens (Euclid is featured in the prologue of the Theætetus, which is taking place in Megara (Theætetus, 142b-c), and is supposed by the fiction of this prologue to be the author of the text of the reported conversation between Socrates and Theætetus read to him and Terpsion by a slave, and possibly of the whole trilogy it is a part of, icluding also the Sophist and Statesman, which are supposed to have taken place with the same cast of characters, plus the Elean Stranger, the day following the one in which is supposed to have taken place the dialogue between Socrates and Theætetus).