or AGATHYRNUM, AGATHYRSA, (Polybius;) AGATHYRUM, (Strabo;) a town of Sicily; now S. Marco; as old as the war of Troy, being built by Agathyrus, son of Aeolus, on an eminence. The gentilissimus name is Agathyraeus; or, according to the Roman idiom, Agathyrensis.