Why the Roman Empire Fell

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The east-west split of the empire (395 CE)
After Emperor Theodosius I established Christianity as the sole official religion of the Roman Empire in 393, he died in 395, and the empire was inherited by his two sons and split into the Eastern and Western Roman Empires. From this point on, the two empires effectively went their separate ways.
The great migration and invasions of Germanic peoples
In the late 4th century, various Germanic tribes, pressured by the Huns, a nomadic people from Central Asia, began moving into Roman territory on a massive scale. Successive invasions — including the Visigoths' sack of Rome (410) and the Vandals' sack of Rome (455) — significantly destabilized the Western Roman Empire's territory and governing capacity.
Economic decline and inflation
The Western Roman economy gradually weakened due to the costs of frequent warfare and border defense, inflation caused by the debasement of currency, and shrinking trade. As the tax burden grew heavier, life became harder for farmers and small merchants, and the empire's fiscal foundation was shaken along with it.
Political turmoil — frequent changes of emperor
Following the Crisis of the Third Century, political instability deepened in the Roman Empire as the army repeatedly installed and deposed emperors. With multiple emperors assassinated or deposed within short periods, this instability at the center of power led to a weakening of governing capacity across the empire as a whole.
The fall of the Western Roman Empire in 476 (Odoacer)
In 476, Odoacer, a Germanic mercenary commander, deposed Romulus Augustulus, the last emperor of the Western Roman Empire, officially bringing about its fall. This event is often considered the symbolic dividing line between antiquity and the Middle Ages.
The Eastern (Byzantine) Empire's millennium-long survival and varying interpretations
While the Western Roman Empire fell, the Eastern (Byzantine) Empire continued for nearly a thousand more years, with Constantinople as its capital, until it fell to the Ottoman Empire in 1453. Among historians, the prevailing view today is that no single cause explains the fall of Rome, but rather a complex combination of military, economic, political, climatic, and epidemiological factors; single-cause explanations, such as Edward Gibbon's "moral decline" thesis, are considered an overly simplified interpretation today.

A complex decline, not a single cause

The fall of the Western Roman Empire was not an event that happened overnight in 476, but the result of political, economic, and military factors accumulating layer upon layer over several centuries. Historians continue to offer a range of interpretations today about which factor was most decisive.

How Rome's legacy was revived

Nearly a thousand years after the fall of the Roman Empire, Europe entered the Renaissance era, covered in our overview of the Renaissance, rediscovering the scholarship and art of ancient Rome and Greece. Take a look at how the legacy of antiquity returned to the center of European civilization.

Frequently Asked Questions

Exactly when did the Western Roman Empire fall?

The Western Roman Empire officially fell in 476, when Odoacer, a Germanic mercenary commander, deposed the last emperor, Romulus Augustulus.

Did the Eastern (Byzantine) Empire fall at the same time?

No. The Eastern Roman Empire continued with Constantinople as its capital even after the fall of the West, surviving for nearly a thousand more years until it fell to the Ottoman Empire in 1453.