Acts 20:1

Evidently soon after the riot Paul left Ephesus to pursue his plan to return to Jerusalem through Macedonia and Achaia (Acts 19:21). He travelled up to Troas where he could have ministered for some time because "a door was opened" for him there (2 Corinthians 2:12). Nevertheless he was uneasy about the trouble in the Corinthian church. He had sent Titus to Corinth, evidently from Ephesus, with a severe letter to the church. He was eager to hear what the reaction to it had been (2 Corinthians 2:3-4; 2 Corinthians 7:8-12; 2 Corinthians 12:18). So rather than staying in Troas, Paul moved west into Macedonia where he met Titus who was returning from Corinth (2 Corinthians 7:5-8). After receiving Titus’ favorable report of affairs in Corinth, Paul wrote 2 Corinthians from somewhere in Macedonia, probably in the fall of A.D. 56 (cf. 2 Corinthians 12:14; 2 Corinthians 13:1-2).