Elaeus or Elaios (Ancient Greek: Ἔλαιος) was a town of ancient Aetolia, belonging to Calydon, was strongly fortified, having received all the necessary munitions from king Attalus I. It was taken by Philip V of Macedon in 219 BCE. Its name indicates that it was situated in a marshy district; and it must have been on the coast to have received supplies from Attalus.
This article incorporates text from a publication now in the public domain: Smith, William, ed. (1854–1857). "Elaeus". Dictionary of Greek and Roman Geography. London: John Murray.