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The Greek philosopher Plato used irony in his dialogues, in which Socrates elicits truth through a pretence of naivety. Sophocles' use of dramatic irony also has a high seriousness, as in Oedipus Rex, in which Oedipus prays for the discovery and punishment of the city's polluter, not knowing that it is himself. Eighteenth-century scepticism provided a natural environment for irony, with Jonathan Swift using the device as a powerful weapon in Gulliver's Travels and elsewhere.