Who Defeated the Roman Empire? West and East Compared
Who defeated the Roman Empire? Compare Odoacer, Alaric, the Vandals, Huns, Persians, the Fourth Crusade and Mehmed II's Ottomans.
Last updated October 2026
Contents9
- Who defeated Rome? At a glance
- Alaric: a sack without the final fall
- The Vandals: territory and a second sack
- Odoacer: the western endpoint
- The Huns: a powerful threat, but not the final conquerors
- Persia: battlefield victories over a surviving empire
- The Fourth Crusade: Constantinople lost, then recovered
- Mehmed II: the final capital fell
- Verdict: Who defeated the Roman Empire
Odoacer ended the western imperial court in Italy by deposing Romulus Augustulus in 476. Mehmed II's Ottomans captured the eastern capital, Constantinople, in 1453. Rome also suffered major earlier defeats and sacks. So no single enemy explains its whole fall. World History Encyclopedia: Fall of the Western Roman Empire World History Encyclopedia: 1453: The Fall of Constantinople
Alaric's Visigoths, the Vandals, Huns, Persians and the Fourth Crusade belong to different stages of the story. The Eastern Roman Empire survived many attacks before its final capital fell. World History Encyclopedia: Roman Empire World History Encyclopedia: Byzantine Empire
TL;DR: Odoacer is the usual answer for the West's final emperor in Italy. Mehmed II is the answer for the East's final capital. Alaric and the Vandals sacked Rome earlier. The Huns and Persians caused serious damage without ending the whole state. Crusaders captured Constantinople before its later recovery.
Who defeated Rome? At a glance
The entries follow World History Encyclopedia, World History Encyclopedia, World History Encyclopedia: Attila the Hun, World History Encyclopedia: Shapur I, World History Encyclopedia: Fourth Crusade, World History Encyclopedia.
| Opponent | Event or stage | What was defeated | Status |
|---|---|---|---|
| Alaric's Visigoths | Sack of Rome in 410 | The city, while the western government survived | Reviewed |
| Vandals under Geiseric | Sack of Rome in 455 | The city and its wealth, before the final deposition | Reviewed |
| Odoacer | Deposition in 476 | The western imperial court in Italy | Reviewed |
| Huns under Attila | Major raids and invasions; western campaigns in 451–452 | Regions and armies, rather than the whole empire's final end | Reviewed |
| Sasanian Persians | Major wars, including Valerian's capture | Roman armies and territories | Reviewed |
| Fourth Crusade | Capture of Constantinople in 1204 | The capital and the existing imperial government there | Reviewed |
| Ottomans under Mehmed II | Capture of Constantinople in 1453 | The restored eastern capital and its final emperor | Reviewed |
| One nation destroyed Rome at one moment | No event fits the whole history | The claim merges different defeats | Disputed |
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Alaric: a sack without the final fall
Alaric's Visigoths sacked Rome in 410. The attack was a major shock because of the city's prestige and its place in Roman memory. It did not at once end western emperors, who continued to rule afterwards. World History Encyclopedia
The event also belonged to a wider relationship between Gothic forces and the Roman government. War, service and negotiation could occur within the same political world. Treating every opponent as wholly outside Rome can hide those ties.
A sack is an attack on a city. The fall of an office is a change in government. Rome's sack damaged the city and its reputation. But the western court survived the event.
For that government's later history, see Western Roman Empire. The gap between the sack and the final deposition makes their different meanings clear.
The Vandals: territory and a second sack
The Vandals established power in North Africa and later sacked Rome in 455. They held key lands and sea routes. Their power hurt the West beyond the sack itself. World History Encyclopedia
North African losses reduced the land and resources available to the western government. A state that lost revenue had less capacity to support armies and government. The sack of Rome was therefore only one visible part of a larger change.
Today, vandal means someone who damages property. The ancient Vandals were a people with their own kingdom. Their actions had political and strategic aims. A label received from later usage is not a complete explanation of their role.
The western office survived this sack too. The sack of 455 did not end the western throne. Later struggles over the army and crown ended it.
Odoacer: the western endpoint
Odoacer defeated the government behind Romulus Augustulus and deposed the emperor in 476. He did not install another western emperor in Italy. His own rule as king supplies the standard political boundary for the West's fall. World History Encyclopedia
The recognised western claimant Julius Nepos was still alive in Dalmatia. His death in 480 gives another possible endpoint for the western title. That qualification does not remove the importance of Odoacer's change in Italy. World History Encyclopedia
Odoacer ended the western court in Italy. Roman culture outlived that court. Officials, law and communities continued under later governments.
See when did the Western Roman Empire fall and last Roman emperor for the final claimants. The overall fall-date page places both dates beside the eastern end.
The Huns: a powerful threat, but not the final conquerors
Attila's Huns attacked Roman regions and demanded payments. His western campaigns entered Gaul in 451 and Italy in 452. They caused destruction and forced the government to respond across a large area. World History Encyclopedia
In Gaul, a Roman-led coalition with Visigothic allies checked his advance at the Catalaunian Fields. In Italy, his forces later withdrew. The reasons for that withdrawal are debated. It should not be reduced to one certain miraculous or personal encounter.
Attila did not depose Romulus, and he did not capture Constantinople. His campaigns put great pressure on Rome. They did not end either imperial court.
The Huns also show why alliances need attention. Forces could cooperate with Rome at one point and fight it at another. The late empire's military history is more complex than a permanent list of Roman and non-Roman sides.
Persia: battlefield victories over a surviving empire
The Persian empires were long-standing rivals on Rome's eastern frontier. Shapur I of the Sasanian dynasty won major victories and captured the emperor Valerian. That was an extraordinary defeat for a Roman ruler. But the Roman state continued. World History Encyclopedia
Stories about Valerian's later treatment are much less secure than his capture. The claim that he was used as a footstool belongs to a hostile and legendary tradition. It should not be repeated as though witnessed and independently confirmed.
Persian wars also burdened the later eastern state. Borders, cities and imperial resources could suffer even when neither side ended the other government. A severe defeat and the final fall of an empire remain different outcomes. World History Encyclopedia
The Fourth Crusade: Constantinople lost, then recovered
Crusaders captured Constantinople in 1204. Their expedition had begun with a different goal. But money deals and Byzantine politics helped turn it against the capital. The sack divided the imperial world among rival powers. World History Encyclopedia
Roman successor states remained outside the city. The capital was recovered in 1261, restoring an emperor there. This makes the crusader conquest a major rupture rather than the last endpoint normally used for Byzantine history. World History Encyclopedia
The Byzantine fall page follows the stages from this break to the final siege. The empire returned to its capital with fewer resources than before.
Mehmed II: the final capital fell
Mehmed II's Ottoman army captured Constantinople on 29 May 1453. Artillery, land assaults and naval pressure tested the city's defences. Constantine XI died in the final fighting. World History Encyclopedia
This ended the restored government at the capital. The Ottomans were therefore the final conquerors in the eastern answer. Later outposts fell separately, which is why some regional timelines continue beyond the city's capture.
For the siege itself, see when did the Eastern Roman Empire fall. It explains the walls, cannon and final assault without turning the whole preceding history into one battle.
Verdict: Who defeated the Roman Empire
Odoacer ended western emperors in Italy. Mehmed II conquered the final eastern capital. Earlier attackers defeated armies, took provinces or sacked cities without ending the entire Roman state. Name the event as well as the opponent, and the answer becomes clear.
Sources checked for this page
- Fall of the Western Roman Empire - World History Encyclopedia
- 1453: The Fall of Constantinople - World History Encyclopedia
- Roman Empire - World History Encyclopedia
- Byzantine Empire - World History Encyclopedia
- Attila the Hun - World History Encyclopedia
- Shapur I - World History Encyclopedia
- Fourth Crusade - World History Encyclopedia
Questions people also ask
Who finally defeated the Western Roman Empire?
Odoacer deposed Romulus Augustulus in 476 and did not install another western emperor in Italy.
Who defeated the Eastern Roman Empire?
Mehmed II's Ottoman forces captured Constantinople in 1453.
Did Alaric end the Roman Empire?
No. His Visigoths sacked Rome in 410, but the western imperial government continued.
Did Attila conquer Rome?
He invaded Roman territories, including Italy, but did not capture Rome or end the western imperial office.
Did the Persians ever capture a Roman emperor?
Yes. Shapur I captured Valerian, but the Roman Empire continued after that defeat.
Why is the Fourth Crusade part of the answer?
It captured Constantinople in 1204 and broke the imperial world apart before the capital's later recovery.