
1) Ancient Athenian 2) Dialogue of Plato
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https://www.crosswordclues.com/clue/euthydemus
[dialogue] Euthydemus (Εὐθύδημος, Euthydemos), written circa 384 BCE, is a dialogue by Plato which satirizes what Plato presents as the logical fallacies of the Sophists. In it, Socrates describes to his friend Crito a visit he and various youths paid to two brothers, Euthydemus and Dionysodorus, both of whom were prominent Sophis...
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http://en.wikipedia.org/wiki/Euthydemus_(dialogue)
[tyrant] Euthydemus was a tyrant of the ancient Greek city-state of Sicyon in the 3rd century BC. He ruled jointly with Timocleidas, but the two were deposed by the citizens of Sicyon. They replaced Euthydemus and Timocleidas with Cleinias, although the historian Plutarch believed that Timocleidas ruled jointly with Cleinias. ...
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http://en.wikipedia.org/wiki/Euthydemus_(tyrant)

(from the article `Plato`) ...Plato argues that, since language is an instrument of thought, the test of its rightness is not mere social usage but its genuine capacity to ...
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http://www.britannica.com/eb/a-z/e/54

king of Bactria. At first he was probably a satrap (governor) of the Bactrian king Diodotus II, whom he later killed and whose throne he usurped. In ... [3 related articles]
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http://www.britannica.com/eb/a-z/e/55
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