An important missionary who spread Christianity was Paul the Apostle (also known as Saul of Tarsus). He was a major figure in the early Christian church who undertook several missionary journeys across the Mediterranean region, establishing Christian communities and spreading the teachings of Jesus, particularly among non-Jewish populations. Paul's letters and theological contributions were foundational to the development of Christian doctrine, and he is often called the "Missionary of the Gentiles" for his role in expanding Christianity beyond its Jewish origins.
Another significant missionary was Augustine of Canterbury, who was sent by Pope Gregory I in 596 to convert the Anglo-Saxons in England. Augustine successfully converted King Ethelbert of Kent and many of his subjects, beginning the Christianization of England. His mission was the first papally sponsored mission to England and set the stage for the widespread Christianization of the region.
Thus, Paul the Apostle and Augustine of Canterbury are two key figures among important missionaries who spread Christianity.