Achaia in Smiths Bible Dictionary

(trouble) signifies in the New Testament a Roman province which included the whole of the Peloponnesus and the greater part of Hellas proper, with the adjacent islands. This province, with that of Macedonia, comprehended the while of Greece; hence Achaia and Macedonia are frequently mentioned together in the New Testament to indicate all Greece. Ac 18:12; 19:21; Ro 15:26; 16:5; 1Co 16:15; 2Co 7:5; 9:2; 11:10; 1Th 1:7,8 In the time of the emperor Claudius it was governed by a proconsul, translated in the Authorized Version "deputy," of Achaia. Ac 18:12