Achaia (a-kâ' yah or a-kä'yah). This was the original name of a district in the northwest of the Peloponnesus: in New Testament times it had a wider signification; for the Roman provinces of Achaia and Macedonia comprehended the whole of Greece. It is in this larger sense that Achaia must be understood. Acts 18:12, Acts 18:27, Acts 19:21, Romans 15:26, Romans 16:5, 1 Corinthians 16:15, 2 Corinthians 1:1, 2 Corinthians 9:2, 2 Corinthians 11:10, 1 Thessalonians 1:1-8. Achaia was first a senatorial province, and had proconsuls. Tiberius changed it into a province imperial under procurators; and Claudius restored it to the senate. Hence Gallio, before whom Paul appeared, was proconsul. Corinth was the capital city.