In Thessalonica, Paul convinced many people that Jesus is the Messiah.

Acts 17:1-4

17 Paul and Silas traveled through Amphipolis and Apollonia towns and arrived at Thessalonica city. There was a Jewish meeting place there. 2 ◄On the Sabbath/On the Jewish rest day► Paul went into the meeting house, as he usually did. For three weeks he went there on each Jewish day of rest. Referring to the Scriptures about the Messiah, he spoke to the people who were there. 3 He explained and showed that the prophets wrote that the Messiah needed to die and ◄to become alive again/to be raised from the dead afterwards►. He told them: “This man Jesus, whom I am telling you about, is our Messiah. He died and became alive again, just like the prophets predicted.” 4 Some of the Jews there were persuaded by {believed} what Paul had said and began to associate with Paul and Silas. There were also many non-Jewish people there who worshipped God and many important women who also believed the message about Jesus, and they began to associate with Paul and Silas.