Attila and Genseric

In the space of three years St. Leo the Great twice went out from the walls of Rome to treat with a barbarian king at the head of an army: to Attila the Hun on the river Mincio in 452, and to Genseric the Vandal before the sack of 455. The two episodes are the historical seedbed of Leo’s enduring image as the bishop who saved Rome — but the earliest and most authoritative witness, the contemporary chronicler Prosper of Aquitaine, reports two very different outcomes (a withdrawal in 452, a mitigated plunder in 455), and the famous miracle of the apostles appearing with drawn swords belongs not to the fifth century at all but to medieval legend. This file separates the attested core from the later embellishment per Methodology §3.5.

Tradition: Pan-Orthodox (Church Father / Latin)

The Sources and Their Order

Any honest account of these events must begin with the hierarchy of sources, because the popular picture fuses witnesses separated by eight centuries. The bedrock is Prosper of Aquitaine, whose Epitoma Chronicon was written and successively updated through 455 — Prosper was a contemporary, living through the very years he describes, and a partisan of the Roman see, which makes him both the earliest and the most favorable witness Leo has (Prosper, Epitoma Chronicon, s.a. 452, 455; ed. Mommsen, MGH AA 9; cf. Murray, From Roman to Merovingian Gaul, 62–76). To Prosper we may add the Spanish chronicler Hydatius and, for the political frame, the later Byzantine historians. The miraculous apparition that everyone associates with the Attila meeting appears in none of these. It surfaces first, in a restrained form, in Paul the Deacon’s Historia Romana in the eighth century, and reaches its familiar shape only in Jacobus de Voragine’s Golden Legend around 1260 — and from there into Raphael’s Vatican fresco of 1513–1514 (Wessel, Leo the Great and the Spiritual Rebuilding of a Universal Rome, 1–4, 359–360). Keeping these strata distinct is the whole task of this file.

Attila on the Mincio, 452: The Attested Core

In 451 Attila’s defeat at the Catalaunian Plains had not destroyed him, and in 452 he turned south into Italy. Aquileia was besieged and destroyed; Milan, Pavia (Ticinum), and other northern cities fell or were plundered as the Huns advanced through the Po valley (Heather, The Fall of the Roman Empire, 333–339). The Emperor Valentinian III, withdrawn to the relative safety of Rome, dispatched an embassy to treat with the king. According to Prosper it comprised three men: Pope Leo himself, the former consul Gennadius Avienus, and the praetorian prefect Trygetius (Trigetius). They met Attila in the territory of Mantua, where the river Mincio (Mincius) flows into the Po (Prosper, Epitoma Chronicon, s.a. 452; Neil, Leo the Great, 35–37).

What Prosper actually attests is spare and must be quoted with care. The king, he writes, received the embassy and was so gratified by the presence of the high priest (tanto . . . sacerdotis praesentia laetatus est) that he ordered an end to hostilities and, having promised peace, withdrew beyond the Danube (Prosper, Epitoma Chronicon, s.a. 452). That is the entire attested core: Leo went, Attila was pleased by the priest’s presence, peace was promised, the Huns withdrew. Even here Prosper’s bias shows — he names all three envoys but assigns the credit to Leo alone, saying nothing of what Avienus or Trygetius, the men of secular rank, contributed to the negotiation (Wessel, 359–360). There is in Prosper no vision, no apparition, no threat from heaven — only a meeting and a withdrawal.

What the Historians Add: The Material Causes

Modern scholarship does not deny the embassy; it sets it within a field of pressures that Prosper, writing to Leo’s glory, had no reason to mention. Attila’s withdrawal had material causes that would have weighed on any commander. Italy had suffered a severe famine in 451 and a poor harvest in 452, so that a large army living off the land faced mounting supply problems; plague or epidemic disease had broken out among the Huns in the malarial Po valley; and Attila had already stripped the north of plunder (Heather, 339–342; Kelly, Attila the Hun, 188–193). Decisively, the Eastern emperor Marcian had sent armies across the Danube into the Hunnic homelands behind Attila’s back — a strategic threat to his base that gave him every reason to turn home (Heather, 340–341). A campaigning season cut short by hunger, sickness, and a threat to the rear is, to the military historian, sufficient explanation on its own.

The result is not that Leo’s embassy was irrelevant but that it was one factor among several, and very possibly the diplomatic occasion that let Attila retire on terms he already had reason to want. The honest formulation is neither the credulous one (Leo’s holiness alone turned the Huns) nor the cynical one (the embassy was theater); it is that a real embassy, in which Leo took a real and conspicuous part, coincided with material pressures that made withdrawal the king’s interest, and that the contemporary record credits the meeting while later sources alone credit a miracle. [Disputed: how much causal weight the embassy itself carried is genuinely contested — Prosper (contemporary) attributes the withdrawal to Leo’s presence; modern historians (Heather, Kelly) weight the famine, plague, and Marcian’s Danubian counter-offensive as the decisive factors, treating the embassy as the face-saving occasion rather than the cause.]

The Apostles with Swords: A Legend and Its Date

The detail that fixed this meeting in the Western imagination — Sts. Peter and Paul appearing in the air above Leo, swords drawn, threatening Attila with death should he not obey the pope — is wholly absent from the contemporary record and must be pinned to its actual source per Methodology §3.5. The earliest form of any such marvel appears in Paul the Deacon’s Historia Romana (late eighth century), where Attila, asked by his men why he had yielded, is made to say that he had seen beside the pope a single figure in priestly garb, of majestic bearing and venerable grey hair, who drew a sword and threatened him with death if he did not grant what Leo asked (Paul the Deacon, Historia Romana 14; cf. Wessel, 359). Three centuries after the event, this is already legend, not testimony.

The familiar two apostles with drawn swords belong to a still later stratum: Jacobus de Voragine‘s Golden Legend, compiled around 1260, where the single figure has become Peter and Paul, vested as bishops, standing on Leo’s right and left with swords stretched over his head (Jacobus de Voragine, Golden Legend, “St. Leo, Pope”). From the Golden Legend the image passed into Raphael’s fresco The Meeting of Leo the Great and Attila in the Vatican Stanze (1513–1514), which gave it its monumental and now canonical form. The trajectory is a textbook case of hagiographical growth: silence in the contemporary chronicle (452), a single sword-bearing figure eight centuries on (Paul the Deacon, c. 790s), the two apostles in the high Middle Ages (Voragine, c. 1260), and the great Renaissance image (Raphael, 1514). The apparition is not evidence about 452; it is evidence about how later centuries remembered and magnified Leo. Attila himself died the following year, in 453, of a hemorrhage on the night of his marriage — his empire dissolving within a generation (Prosper, Epitoma Chronicon, s.a. 453; Heather, 351–354).

Genseric and the Vandals, 455: Mitigation, Not Deliverance

Three years later Leo went out from Rome a second time, and the outcome was markedly different — a fact the heroic tradition tends to blur. The murder of Valentinian III on 16 March 455 and the brief, chaotic reign of Petronius Maximus gave the Vandal king Genseric (Gaiseric) both a pretext and an opening. Sailing from Carthage, the Vandals landed at the mouth of the Tiber, and Rome lay open before them (Prosper, Epitoma Chronicon, s.a. 455; Heather, 375–378).

Prosper again places Leo at the gate. The pope went out to meet Genseric and obtained from him that the city would not be burned, that the people would not be put to the sword, and that there would be no torture or execution of the populace; some accounts add that the three great basilicas — St. Peter’s, St. Paul’s-outside-the-Walls, and St. John Lateran — were to be spared as places of refuge (Prosper, Epitoma Chronicon, s.a. 455; Neil, 37–40). But Prosper is equally clear about what followed: with all under his power, the king proceeded to a systematic, fourteen-day plunder of the city (2–16 June 455). The Vandals stripped Rome of its movable wealth, carried off treasures including, by tradition, the spoils of the Temple of Jerusalem that Titus had once brought to Rome, and took captives back to Carthage — among them the empress Eudoxia and her two daughters (Prosper, Epitoma Chronicon, s.a. 455; Heather, 378–379).

The difference from 452 is the whole point. With Attila, the attested result was a withdrawal: the threat went away. With Genseric, the attested result was a mitigation: the city was sacked, methodically and for two weeks, but lives and (in the favorable account) the great churches were spared. Leo did not prevent the sack of 455; on the most generous reading of the sources he made it less murderous than it might have been. To call 455 a deliverance, as the later tradition is tempted to, is to confuse it with 452 (Wessel, 360–361; Neil, 38–40).

The Historicity Debate, Handled Evenly

Both episodes carry a genuine historiographical question, and it should be stated without either deflation or inflation. For 452, the question is causal: did Leo’s embassy procure the withdrawal, or merely accompany it? The contemporary source (Prosper) credits Leo; the modern reconstruction (Heather, Kelly) credits famine, plague, and Marcian’s offensive, with the embassy as occasion. The two readings are not strictly incompatible — an embassy can be the proximate means by which a king already inclined to leave departs with honor — and the responsible verdict is that Leo’s role was real but partial.

For 455, the question is how much the meeting altered Genseric’s conduct. Prosper, the partisan witness, presents the restraint from burning and slaughter as Leo’s achievement; sceptics note that Genseric had his own reasons not to destroy a city he meant to loot at leisure, and the Byzantine historian Procopius, writing later, even reports the burning of a church — complicating Prosper’s “no fire” (Procopius, Wars 3.5; Wessel, 360). What is not in serious doubt is the bare fact of Leo’s intervention at both gates; what is debated is its weight. The figure that emerges from the sources, soberly read, is not a wonder-worker who turned armies back by holiness alone, but a bishop who — in an age when the emperors had failed — repeatedly went out to negotiate for his city, and whose courage the contemporary record honors even where it cannot prove it decisive (Neil, 40–42; Wessel, 358–362). The companion file on Leo as defender of the city takes up what that repeated intervention meant for the office he held.

References

Prosper of Aquitaine, Epitoma Chronicon, s.a. 452, 453, 455; ed. Theodor Mommsen, Monumenta Germaniae Historica, Auctores Antiquissimi 9 (Berlin, 1892); trans. in Alexander Callander Murray, From Roman to Merovingian Gaul: A Reader (Peterborough, ON: Broadview, 2000), 62–76.
Hydatius, Chronicon, s.a. 452–455.
Paul the Deacon, Historia Romana 14 (late 8th c.); ed. Hans Droysen, MGH AA 2 (Berlin, 1879).
Jacobus de Voragine, The Golden Legend (Legenda Aurea, c. 1260), “St. Leo, Pope”; trans. William Granger Ryan (Princeton: Princeton University Press, 1993).
Procopius, History of the Wars 3 (Vandalic War) 5.
Susan Wessel, Leo the Great and the Spiritual Rebuilding of a Universal Rome (Leiden: Brill, 2008).
Bronwen Neil, Leo the Great, The Early Church Fathers (London: Routledge, 2009).
Peter Heather, The Fall of the Roman Empire: A New History of Rome and the Barbarians (Oxford: Oxford University Press, 2006).
Christopher Kelly, Attila the Hun: Barbarian Terror and the Fall of the Roman Empire (London: Bodley Head, 2008).