St. Augustine of Canterbury (not to be confused with St. Augustine of Hippo, St. Monica's son) was prior of the monastery from whence came Pope Gregory the Great. When Pope Gregory decided to send a missionary group to evangelize the pagans, he immediately thought of his former prior. Augustine, along with 30 companions, made the dangerous trip into the unknown area we now know as England. Christians had gone before to evangelize but the Saxon victory over the lands drove those Christians into hiding -- St. Augustine's mission was to bring them the Gospel, help the Christians come out of hiding, and convert the other inhabitants. St. Augustine worked with all the peoples of England for eight years before his death.
For a wonderful living book about Augustine and his travails, Augustine Came to Kent is an excellent resource (and makes a wonderful family read-aloud).
St. Augustine, you went forth into unknown and unfriendly lands to bring Christ to the peoples, help us always to be willing to go where God wills. St. Augustine, pray for us!