Assos (anc. geog.), a town of Troas (though by others supposed to be of Mysia), and the same with Apollonia (Pliny); but different from the Apollonia on the river Rhodacus. Ptolemy places it on the sea-coast, but Strabo more inland; if he does not mean the head of an inland bay, as appears from Diodorus Siculus. It was the country of Cleantus the stoic philosopher, who succeeded Zeno. St Luke and others of St Paul's companions in his voyage (Acts xx. 13, 14), went by sea from Troas to Assos: but St Paul went by land thither, and meeting them at Assos, they all went together to Mytilene. It is still called Assos. E. Long. 27° 30'. Lat. 38° 30'.