This adjective means Galatian or belonging to Galatia, a region in central Asia Minor (modern Turkey). The area was inhabited by Celtic tribes who migrated there in the third century BC, giving the region its distinctive character. In Acts, Luke twice describes Paul's missionary journeys through 'the Galatian region' or 'the Galatian country' (Acts 16:6; 18:23). These references indicate Paul's evangelistic work in the interior of Asia Minor, establishing the churches he would later address in his letter to the Galatians. The adjective functions geographically to specify which region Paul traversed during his second and third missionary journeys.