| Battle of Milvian Bridge | |||||||
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| Part of the Wars of Constantine I | |||||||
Dream of Constantine I and battle of the Milvian Bridge |
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| Belligerents | |||||||
| Constantinian forces | Maxentian forces | ||||||
| Commanders | |||||||
| Constantine I | Maxentius† | ||||||
| Strength | |||||||
| ~100,000 men | ~75,000-120,000 men | ||||||
| Casualties and losses | |||||||
| Unknown | Unknown | ||||||
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The Battle of the Milvian Bridge took place between the Roman Emperors Constantine I and Maxentius on October 28, 312. Constantine won the battle and started on the path that led him to end the Tetrarchy and become the sole ruler of the Roman Empire.
According to chroniclers such as Eusebius, the battle marked the beginning of Constantine's conversion to Christianity. Eusebius recounts that Constantine and his soldiers had a vision that God promised victory if they daubed the labarum on their standards. The Arch of Constantine, erected in celebration of the victory, certainly attributes Constantine's success to divine intervention, but whether it was specifically at the hands of the Christian God is left ambiguous.
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The underlying causes of the battle were the rivalries inherent in Diocletian's Tetrarchy System. Once the strong Diocletian stepped down, the weaker rulers who took over began to struggle for control of the Roman Empire almost immediately. Although Constantine was the son of the western emperor Constantius Chlorus, the system in place at the time, the tetrarchy, didn't necessarily provide for hereditary succession. When Constantius died on July 25, 306, his father's troops proclaimed Constantine as Augustus in Eboracum (York) . In Rome, the favorite was Maxentius, the son of Constantius' predecessor Maximian, who was made emperor on October 28 of the same year.
By 312, the two men were engaged in open hostility with one another, although they were brothers-in‑law through Constantine's marriage to Fausta, sister of Maxentius. In the spring of 312, Constantine gathered his forces and decided to settle the dispute by force. He easily overran northern Italy, winning two major battles: the first near Turin, the second at Verona, where the praetorian prefect Ruricius Pompeianus, Maxentius' most senior general, was killed.[1]
It is commonly stated that on the evening of October 27, with the armies preparing for battle, Constantine had a vision which led him to fight under the protection of the Christian God. The details of that vision, however, differ between the sources reporting it. Most stories of the vision claim that the sign of the cross appeared and Constantine heard "In this sign, you shall conquer" in Greek.
Lactantius states that, in the night before the battle, Constantine was commanded in a dream to "delineate the heavenly sign on the shields of his soldiers" (de mort. pers. 44,5). He obeyed and marked the shields with a sign "denoting Christ". Lactantius describes that sign as a "staurogram", or a Latin cross with its upper end rounded in a P-like fashion.[2] There is no certain evidence that Constantine ever used that sign, opposed to the better known chi-rho sign described by Eusebius.
From Eusebius, two accounts of the battle survive. The first, shorter one in the Ecclesiastical History leaves no doubt that God helped Constantine but doesn't mention any vision. In his later Life of Constantine, Eusebius gives a detailed account of a vision and stresses that he had heard the story from the emperor himself. According to this version, Constantine with his army was marching somewhere (Eusebius doesn't specify the actual location of the event, but it clearly isn't in the camp at Rome), when he looked up to the sun and saw a cross of light above it, and with it the Greek words "Εν Τούτῳ Νίκα". The Latin translation is in hoc signo vinces — "In this (sign), conquer". At first he was unsure of the meaning of the apparition, but in the following night he had a dream in which Christ explained to him that he should use the sign against his enemies. Eusebius then continues to describe the labarum, the military standard used by Constantine in his later wars against Licinius, showing the chi-rho sign.[3]
Those two accounts can hardly be reconciled with each other, though they have been merged in popular notion into Constantine seeing the Chi-Rho sign at the evening before battle. Both authors agree that the sign wasn't readily understandable to denote Christ, which corresponds to the fact that there is no certain evidence of the use of chi-rho as a Christian sign before Constantine. Its first appearance is on a Constantinian silver coin from c. 315, which proves that Constantine did use the sign at that time, though not very prominently. He made extensive use of the Chi-Rho and the Labarum only later in the conflict with Licinius.
As the god Sol Invictus, the Unconquered Sun, featured prominently on Constantinian coins and monuments in the years before and after the battle, the vision has been interpreted in a solar context (e.g. as a halo phenomenon), which would have been reshaped to fit with the Christian beliefs of the later Constantine.
Constantine reached Rome at the end of October 312 approaching along the Via Flaminia. He camped at the location of Malborghetto near Prima Porta, where remains of a Constantinian monument in honour of the occasion are still extant.
It was expected that Maxentius would remain within Rome and endure a siege, as he already had successfully employed this strategy during the invasions of Severus and Galerius in 307 and 308, respectively. He had already brought large amounts of food to the city in preparation. Surprisingly, he decided otherwise and met Constantine in open battle. Ancient sources about the event attribute this decision either to divine intervention (e.g. Lactantius, Eusebius) or superstition (e.g. Zosimus). They also note that the day of the battle was the same as the day of his accession (October 28), which was generally thought to be a good omen. Lactantius also reports that the populace supported Constantine with acclamations during circus games, though it isn't clear how reliable his account of the events is.[4]
Maxentius chose to make his stand in front of the Milvian Bridge, a stone bridge that carries the Via Flaminia road across the Tiber River into Rome (the bridge stands today at the same site, somewhat remodelled, named in Italian Ponte Milvio or sometimes Ponte Molle, soft bridge). Holding it was crucial if Maxentius was to keep his rival out of Rome, where the Senate would surely favour whoever held the city. As Maxentius had probably partially destroyed the bridge during his preparations for a siege, he had a wooden or pontoon bridge constructed to get his army across the river. The sources vary as to the nature of the bridge central to the events of the battle. Zosimus mentions it, vaguely, as being a wooden constuction others specify that it was a pontoon bridge; sources are also unclear as to whether the bridge was deliberately constructed as a collapsible trap for Constantine's forces or not.[5]
The next day, the two armies clashed, Constantine emerged victorious. The dispositions of Maxentius may have been faulty as his troops seem to have been arrayed with the River Tiber too close to their rear, giving them little space to allow re-grouping in the event of their formations being forced to give ground.[6] Already known as a skillful general, Constantine first launched his cavalry at the cavalry of Maxentius and broke them. Constantine's infantry then advanced, most of Maxentius's troops fought well but they began to be pushed back toward the Tiber; Maxentius decided to retreat and make another stand at Rome itself; but there was only one escape route, via the bridge. Constantine's men inflicted heavy losses on the retreating army.[7] Finally, the temporary bridge set up alongside the Milvian Bridge, over which many of the troops were escaping, collapsed, and those men stranded on the north bank of the Tiber were either taken prisoner or killed. Maxentius' Praetorian Guard seem to have made a stubborn stand on the northern bank of the river.[8] Maxentius was among the dead, having drowned in the river while trying to swim across it in a desperate bid to escape, or alternatively, he is described as having been thrown by his horse into the river.[9]
Constantine entered Rome on 29 October.[10] He staged a grand adventus in the city, and was met with popular jubilation.[11] Maxentius' body was fished out of the Tiber and decapitated. His head was paraded through the streets for all to see.[12] After the ceremonies, Maxentius' disembodied head was sent to Carthage, after which Africa gave no further resistance. The battle gave Constantine undisputed control of the western half of the Roman Empire. Following the battle, Constantine ignored the altars to the gods prepared on the Capitoline to receive sacrifices appropriate for the celebration of his victorious entry into Rome, and the new emperor instead went straight to the imperial palace without performing any sacrifice.[13] He chose to honor the Senatorial Curia with a visit,[14] where he promised to restore its ancestral privileges and give it a secure role in his reformed government: there would be no revenge against Maxentius' supporters.[15] Maxentius was condemned to damnatio memoriae, all his legislation was invalidated and Constantine usurped all of Maxentius' considerable building projects within Rome, including the Temple of Romulus and the Basilica of Maxentius. Maxentius' strongest supporters in the military were neutralized when the Praetorian Guard and Imperial Horse Guard (equites singulares) were disbanded.[16] Constantine is thought to have replaced the former imperial guards with a number of cavalry units termed the Scholae Palatinae.
The most important ancient sources for the battle are Lactantius, De mortibus persecutorum 44; Eusebius of Caesarea, Ecclesiastical History ix, 9 and Life of Constantine i, 28-31 (the vision) and i, 38 (the actual battle); Zosimus ii, 15-16; and the Panegyrici Latini of 313 (anonymous) and 321 (by Nazarititus).
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