HALUNTIUM (Gr. Ἀλόντιον, mod. S. Marco d’Alunzio), an ancient city of Sicily, 6 m. from the north coast and 25 m. E.N.E. of Halaesa. It was probably of Sicel origin, though its foundation was ascribed to some of the companions of Aeneas. It appears first in Roman times as a place of some importance, and suffered considerably at the hands of Verres. The abandoned church of S. Mark, just outside the modern town, is built into the cella of an ancient Greek temple, which measures 62 ft. by 18. A number of ancient inscriptions have been found there.