Matthew Poole and continuators on Acts 13:5

5 And when they were at Salamis, they preached the word of God in the Synagogues of the Jews: and they had also John to their Minister.

The chief City of Cyprus, now called Famagusta, scituate on the East-side of the Island, over-against Syria.

They preached here, and elsewhere in the Synagogues, either because they found no such convenient places to Preach in; (these being large Structures, and many resorting to them;) or rather, because tho they were sent unto the Gentiles, yet it was not till after the Iews should have refused the Gospel, as may be seen throughout all this Book, and in the conclusion of it, Chap. 28.28.

As Chap. 12. & 25.