The victory that changed history

The Arch of Constantine was built to celebrate an event that would change the course of history: the Battle of the Milvian Bridge, fought on 28 October 312 AD at the gates of Rome. Here Constantine defeated his rival Maxentius, becoming master of the West and ushering in a new era. That victory was more than a military one: according to Christian tradition, it also marked Constantine's turn toward Christianity.

Constantine against Maxentius

At the start of the 4th century the empire was split among several emperors. Constantine marched on Rome and confronted Maxentius, who held the city. The decisive clash came at the Milvian Bridge (Ponte Milvio), on the Tiber north of Rome: Maxentius's army was overwhelmed and Maxentius himself drowned in the river during the retreat. Rome threw open its gates and welcomed Constantine as a liberator.

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"In hoc signo vinces"

The most famous episode, recounted by Christian authors, is Constantine's vision: before the battle, the emperor is said to have seen a sign in the sky (the cross or the monogram of Christ) bearing the words "In hoc signo vinces" ("In this sign you will conquer"). He then ordered the Christian symbol painted on his soldiers' shields. History or legend, the account bound the victory at the Milvian Bridge forever to the Christian faith.

The turning point for Christians

A few months after the victory, in 313 AD, Constantine issued (together with Licinius) the Edict of Milan, which guaranteed freedom of worship throughout the empire and put an end to the persecution of Christians. The Battle of the Milvian Bridge is therefore seen as a watershed in history: the beginning of the path that would make Christianity the dominant religion of the empire.

Where to relive this story in Rome

  • The Arch of Constantine, which celebrates the victory through its reliefs.
  • The arch's Constantinian frieze, which narrates the campaign up to the battle.
  • The Milvian Bridge (Ponte Milvio), still standing today north of Rome.
  • The Basilica of Maxentius in the Roman Forum, completed by Constantine himself.

Frequently asked questions

What was the Battle of the Milvian Bridge? The clash of 28 October 312 AD in which Constantine defeated Maxentius at the gates of Rome, becoming master of the West. It is the event celebrated by the Arch of Constantine.

What does "In hoc signo vinces" mean? "In this sign you will conquer": the words that, according to tradition, Constantine saw in the sky alongside the Christian sign before the battle.

Why is it so important? Because it paved the way for the Edict of Milan of 313 AD, which guaranteed freedom of worship and ended the persecution of Christians: a historic turning point.

Did Maxentius die in the battle? Yes. According to the sources, he drowned in the Tiber during the retreat, near the Milvian Bridge.

Can you still see the Milvian Bridge? Yes, the Milvian Bridge (Ponte Milvio) still stands, north of central Rome, and is a lively part of the city today.

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Article #527 · Category: Monuments · Updated: May 2026