Eleuterus was a Greek-born bishop of Rome who led the church from approximately 174 until his death in 189. Born in Nicopolis, he previously served as a deacon under Pope Anicetus and Pope Soter before ascending to the papacy. His leadership is associated with various historical traditions, including a legend involving a letter from a British king named Lucius requesting Christian conversion. He is recognized as a saint in the Catholic tradition.