Dium or Dion () was a town of ancient Crete.See, e.g., Eusebius, Praep. Ev. 5.31-32. Pliny the Elder speaks of it as an inland town. However, Ptolemy discusses a promontory on the north coast of Crete, at its greatest breadth, called Dium Promontorium (Δίον ἄκρον - Dion akron), leading some to suppose a connection to the town.
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