I’ve never noticed the ruler Sergius Paulus before in the Bible.
He came in contact with Paul and soon after became a Christian. He was a governor and on the island of Paphos. There was also a Jewish sorceror and false prophet who was his friend and influenced him.
6 Afterward they traveled from town to town across the entire island until finally they reached Paphos, where they met a Jewish sorcerer, a false prophet named Bar-Jesus. 7 He had attached himself to the governor, Sergius Paulus, who was an intelligent man. The governor invited Barnabas and Saul to visit him, for he wanted to hear the word of God. 8 But Elymas, the sorcerer (as his name means in Greek), interfered and urged the governor to pay no attention to what Barnabas and Saul said. He was trying to keep the governor from believing.
9 Saul, also known as Paul, was filled with the Holy Spirit, and he looked the sorcerer in the eye. 10 Then he said, “You son of the devil, full of every sort of deceit and fraud, and enemy of all that is good! Will you never stop perverting the true ways of the Lord? 11 Watch now, for the Lord has laid his hand of punishment upon you, and you will be struck blind. You will not see the sunlight for some time.” Instantly mist and darkness came over the man’s eyes, and he began groping around begging for someone to take his hand and lead him.
12 When the governor saw what had happened, he became a believer, for he was astonished at the teaching about the Lord.