Paul’s ministry in Europe began in Macedonia, where in Philippi, Thessalonica, and Berea, he preached with power and saw many come to faith in Jesus.
But resistance was strong, angry, and at times, violent. From Berea Paul moved on to Athens and Corinth in Achaia (southern Greece). While there, he received a report from Timothy about the church in Thessalonica, to which he responded with 1 Thessalonians. 2 Thessalonians followed later, after another and disturbing report reached him about the situation in Macedonia.
The general impression we get from these two letters is that the church in Thessalonica was faithful and outspoken about its faith in Jesus Christ.