Thessalonica. A city in the Roman province of Macedonia where Paul had established a church on his second missionary journey (Acts 17:1–10).
Crescens. Mentioned nowhere else in the New Testament, he was apparently another of Paul’s coworkers.
Galatia. A Roman province Paul visited on his first missionary journey (3:11 note).
Titus. Another of Paul’s coworkers. See Introduction to Titus: Date and Occasion.
Dalmatia. Another name for the Roman province of Illyricum, the westernmost province reached by Paul on his first three missionary journeys (Rom. 15:19).