Asia

is used to denote Proconsular Asia, a Roman province which
embraced the western parts of Asia Minor, and of which Ephesus
was the capital, in Acts 2:9; 6:9; 16:6; 19:10,22; 20:4, 16, 18,
etc., and probably Asia Minor in Acts 19:26, 27; 21:27; 24:18;
27:2. Proconsular Asia contained the seven churches of the
Apocalypse (Rev. 1:11). The "chiefs of Asia" (Acts 19:31) were
certain wealthy citizens who were annually elected to preside
over the games and religious festivals of the several cities to
which they belonged. Some of these "Asiarchs" were Paul's
friends.