Here we notice that in acts the term "Hellenes" (or "Greeks") is used with noteworthy propriety: the people of Thessalonica, of Berea, of Ephesus, of Iconium. and of Syrian Antioch are spoken of as Hellenes. Those were all cities which had no claim to be Roman, except in the general way of being parts of the Roman provinces Macedonia, Galatia, and Syria. They were counted Greek cities, and reckoned themselves as such.
Historical Commentary on First Corinthians, p. 34