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Most ancient Greek and Roman chroniclers, poets, grammarians and scholars ( Eratosthenes, Varro, Apollodorus of Athens, Ovid, Censorinus, Catullus, and Castor of Rhodes ) believed in a threefold division of history: ádelon ( obscure ), mythikón ( mythical ) and historikón ( historical ) periods.
According to the Roman grammarian Censorinus the first period, the ádelon ( obscure ), was calculated by Varro as follows:

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