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Lucius Sergius Paulus or Paullus was a Proconsul of Cyprus under Claudius (r. 41-54 AD).
He appears in Acts 13:6-12, where in Paphos, Paul, accompanied by Barnabas and John Mark, overcame the attempts of Elymas "to turn the proconsul away from the faith" and converted Sergius to Christianity.
General info from Wikipedia.org