Saint Leo the Great (pope 440 - 461) convinced Attila's Huns to turn back

“The old man of harmless simplicity, venerable in his gray hair and his majestic garb, ready of his own will to give himself entirely for the defense of his flock, went forth to meet the tyrant who was destroying all things. He met Attila, it is said, in the neighborhood of the river Mincio, and he spoke to the grim monarch, saying ‘The senate and the people of Rome, once conquerors of the world, now indeed vanquished, come before thee as suppliants. We pray for mercy and deliverance. O Attila, thou king of kings, thou couldst have no greater glory than to see suppliant at thy feet this people before whom once all peoples and kings lay suppliant. Thou hast subdued, O Attila, the whole circle of the lands which it was granted to the Romans, victors over all peoples, to conquer. Now we pray that thou, who hast conquered others, shouldst conquer thyself. The people have felt thy scourge; now as suppliants they would feel thy mercy.’ ”