The apostle Paul (1:1; 9:1-2), twenty-five years after he was called (Acts 9:3-6, 15-16) and fourteen years after he was sent to the Gentiles (Acts 13:1-4, 14:14).

Approximately A.D. 59, near the end of Paul's three-year stay in Ephesus (Acts 20:31; 1 Cor. 16:8).

Ephesus (Acts 19:21-22; 1 Cor. 16:3-8, 19).

The saints — the church — in Corinth and all who call upon the name of our Lord Jesus Christ in every place (1:2).