~45-65 · Antioch, Turkey (starting point)
Missionary Journeys of St. Paul
A former persecutor of Christians spent roughly twenty years crisscrossing the Roman Empire by foot and ship, planting churches from Syria to Greece and writing letters that became half the New Testament.
Between roughly 45 and 65 AD, Paul of Tarsus made at least three major missionary trips through Asia Minor, Greece, and the eastern Mediterranean. He had been a Pharisee named Saul who actively hunted down Christians until a blinding encounter on the road to Damascus turned his life inside out. After that, he became the most relentless evangelist the early Church ever produced. He walked hundreds of miles on Roman roads, got shipwrecked, beaten, stoned, and imprisoned. In every city, he followed the same pattern: start in the synagogue, preach Christ crucified, get thrown out, gather the converts, and move on. The communities he left behind were messy, quarrelsome, and confused about everything from sexual ethics to meat sacrificed to idols. His letters back to them, dashed off to solve specific problems, turned out to be some of the most important theological documents ever written. Paul did not invent Christianity, but he did more than anyone else to rip it free from its purely Jewish context and make it available to the wider world. Without his stubborn insistence that Gentiles did not need to become Jews first, the Church might have remained a small sect in Palestine.
Why it matters
Established Christianity as a universal faith rather than a Jewish sect, founded churches across the Roman Empire, and produced letters that became foundational Christian theology.
What Happened
Paul undertook at least three extended missionary trips, beginning from Antioch in Syria. He traveled through Cyprus, modern-day Turkey, Greece, and eventually to Rome. Along the way he founded churches in Corinth, Philippi, Thessalonica, Ephesus, and elsewhere. He clashed with other apostles, particularly over whether Gentile converts needed circumcision. The Council of Jerusalem around 49 AD sided largely with him. He wrote letters to his churches that addressed everything from resurrection theology to collection funds for the poor in Jerusalem.
Why It Still Matters
Paul's letters make up thirteen of the twenty-seven books in the New Testament. His theology of grace, justification by faith, and the body of Christ as a metaphor for the Church still shapes how Catholics understand salvation. His decision to bring the Gospel to non-Jews was the single most consequential strategic choice in Christian history. Every Catholic parish that exists outside the Middle East is, in some sense, a product of what Paul started.