1 Thessalonians 1:7-10
So that you were ensamples to all that believe in Macedonia and Achaia.…
signifies a Roman province, which included the whole of the Peloponnesus and the greater part of Hellas proper, with the adjacent islands. This, with Macedonia, comprehended the whole of Greece. Hence both are frequently mentioned together. A narrow slip on the north coast was originally called Achaia, the cities of which were confederated in an ancient league, which was renewed, B.C. 280, for the purpose of resisting the Macedonians. This league subsequently included several of the other states, and became the most powerful political body in Greece; and hence it was natural for the Romans to apply the name of Achaia to the Peloponnesus, and the south where they took Corinth and destroyed the league, B.C. 146. In the division of the provinces by Augustus, between the Emperor and the Senate in B.C. 27, Achaia was one of the provinces assigned to the latter, and was governed by a proconsul. Tiberius, in A.D. 16, took it away from the Senate and made it an imperial province, governed by a procurator. Claudius restored it to the Senate. This was its condition when Paul was brought before Gallio, the proconsul (Acts 18:12).
(Sir G. Grove, LL. D.)
Parallel VersesKJV: So that ye were ensamples to all that believe in Macedonia and Achaia.