The Apostle Paul, originally known as Saul of Tarsus, was a key figure in early Christianity. He was born in the city of Tarsus, in present-day Turkey, and was a Roman citizen. Initially, Paul persecuted Christians but experienced a dramatic conversion on the road to Damascus, where he became a devoted follower of Jesus Christ. Paul is best known for his missionary journeys throughout the Roman Empire and for writing many letters, or epistles, that form a significant part of the New Testament. His teachings emphasized faith, grace, and the importance of spreading the message of Christianity to both Jews and Gentiles.