Anonymous: Attila and Leo the Great (A.D. 452)
Attila, the leader of the Huns, who was called the scourge of God, came into Italy, inflamed with fury, after he had laid waste with most savage frenzy Thrace and Illyricum, Macedonia and Moesia, Achaia and Greece, Pannonia and Germany. He was utterly cruel in inflicting torture, greedy in plundering, insolent in abuse. . . . He destroyed Aquileia from the foundations and razed to the ground those regal cities, Pavia and Milan; he laid waste many other towns, and was rushing down upon Rome.
Then Leo had compassion on the calamity of Italy and Rome, and with one of the consuls and a large part of the Roman senate he went to meet Attila. 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."
As Leo said these things Attila stood looking upon his venerable garb and aspect, silent, as if thinking deeply. And lo, suddenly there were seen the apostles Peter and Paul, clad like bishops, standing by Leo, the one on the right hand, the other on the left. They held swords stretched out over his head, and threatened Attila with death if he did not obey the pope's command. Wherefore Attila was appeased, he who had raged as one mad. He by Leo's intercession, straightway promised a lasting peace and withdrew beyond the Danube.
(From the Medieval History Sourcebook.)