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In page Pelasgians:

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Julius Pokorny derived Pelasgoi from *pelag-skoi 'flatland-inhabitants'; specifically, "inhabitants of the Thessalian plain".[5] He details a previous derivation, which appears in English at least as early as William Ewart Gladstone's Studies on Homer and the Homeric Age;[6] if the Pelasgians were not Indo-Europeans, the name in this derivation must have been assigned by the Hellenes. Ernest Klein argued that the ancient Greek word for 'sea', pelagos, and the Doric word plagos 'side' (which is flat), shared the same root, *plāk-, and that *pelag-skoi therefore meant 'the sea men', where the sea is flat.[7] This could be connected to the maritime marauders referred to as the Sea People in Egyptian records.[citation needed]