Note 2 at Acts 18:2: Aquila was a Jew, born in Pontus (see note at this verse) who had been living in Rome with his wife Priscilla. After being expelled from Rome, they came to live in Corinth where they met Paul on his first visit to Corinth. They were tent makers by trade as was the apostle Paul, so Paul lived with them during his stay in Corinth (18 months-v. 11).

Aquila and Priscilla left Corinth with the apostle Paul and went with him to Ephesus (v. 18), remaining there even after Paul left for Jerusalem. While in Ephesus, Aquila and Priscilla encountered Apollos (see note at Acts 18:24, p. ???) who was eloquent and mighty in his teaching of the scriptures, but he didn't have a full revelation of the gospel. Aquila and Priscilla were grounded enough in the scriptures to explain "the way of God more perfectly" unto Apollos.

Paul included a salutation from Aquila and Priscilla to the Corinthians in his first epistle to that church (1 Cor. 16:19). This epistle was written from Asia (1 Cor. 16:19), probably from Ephesus where Aquila and Priscilla were residing. Paul later sent greetings to Aquila and Priscilla who lived in Rome at that time saying that they were his helpers who had "laid down their own necks" for his life (Rom. 16:3-4). Paul also spoke of the church that met in their home in Rome.

Still later, they must have moved back to Ephesus because the apostle Paul again sends greetings to Aquila and Priscilla when he wrote his second epistle to Timothy while he was imprisoned in Rome (2 Tim. 4:19).

Note 3 at Acts 18:2: The name Pontus means "the sea." It was the region occupying the eastern half of Asia Minor coast of the Black Sea. The Black Sea was originally called Pontus Euxinus from which the name Pontus was derived. When conquered by the Romans around 63 B.C., Pontus was merged with Bithynia (see note 5 at Acts 16:7, p. 666) to form the province of Bithynia and Pontus.