In the first century after his crucifixion, the teachings of Jesus quickly spread throughout the Greco-Roman world and his early followers often faced severe persecution. But how did people around the Mediterranean learn of Christ's message? Why did it appeal to them? And how did Christianity change once it was adopted by the Roman Empire? Rob Weinberg puts the big questions about the growth and spread of Christianity to Miri Rubin, Professor of Medieval and Early Modern History at Queen Mary University of London.