According to Acts, the proconsul of Cyprus who heard Paul’s teaching was Sergius Paulus.
Acts 13 describes Paul and Barnabas traveling across Cyprus during their first missionary journey. At Paphos they encounter Sergius Paulus, the island’s proconsul, who wants to hear the word of God. A magician and false prophet named Bar-Jesus, also called Elymas, opposes them. After Paul rebukes Elymas, the man is temporarily blinded, and Acts says the proconsul believes.
The episode is important because it places the Christian mission before a Roman provincial official. It also marks a transition in Acts: the narrative increasingly refers to Saul by the name Paul after the Cyprus episode. The text presents Barnabas and Paul as the missionaries traveling together at this stage.
Sergius Paulus should not be confused with Gallio, the proconsul of Achaia, or with Felix and Festus, Roman governors associated with Paul’s later imprisonment. These officials appear in different locations and episodes in Acts.