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Fall of Rome Timeline: Key Events and History

How the Roman Empire went from its greatest territorial extent under Trajan to the deposition of its last western emperor in 476.

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117 Empire reaches its peak 235–284 Crisis of the Third Century 285 Empire divided by Diocletian 378 Battle of Adrianople 410 Alaric sacks Rome 455 Vandals sack Rome 476 Western Empire ends 476–1453 Eastern Empire endures

117 The Roman Empire reaches its greatest territorial extent under Trajan

Under Emperor Trajan, Roman territory stretched from Britain to Mesopotamia, covering roughly five million square kilometers and tens of millions of people — the largest the empire would ever be.

235–284 Decades of civil war, invasion, and rapid imperial turnover destabilize Rome

Following the death of Severus Alexander in 235, the empire cycled through roughly twenty-six recognized emperors in fifty years amid civil wars, economic strain, and incursions along its frontiers.

285 Diocletian splits the empire into eastern and western halves

Emperor Diocletian restructured the sprawling, crisis-worn empire into separately administered eastern and western portions, a division intended to make governing and defending Roman territory more manageable.

378 Gothic forces destroy a Roman army and kill Emperor Valens

At Adrianople, Visigothic forces inflicted a catastrophic defeat on the eastern Roman army, killing Emperor Valens and exposing the empire's growing vulnerability to peoples along its borders.

410 Visigothic forces under Alaric sack the city of Rome

After years of failed negotiations with the western imperial court, Alaric's Visigoths breached Rome's walls and plundered the city for three days — the first time it had fallen to a foreign force in nearly 800 years.

455 Vandal forces under Genseric plunder Rome for two weeks

Vandal king Genseric entered Rome with little resistance and, despite a reported agreement with Pope Leo I to spare the population, his forces looted the city for roughly two weeks.

476 Romulus Augustulus is deposed by Odoacer

The Germanic general Odoacer deposed the teenage western emperor Romulus Augustulus, an event traditionally treated as marking the end of the Western Roman Empire, though the empire's decline had unfolded over centuries.

476–1453 The Eastern Roman (Byzantine) Empire survives for nearly a millennium more

While the western half of the empire dissolved into successor kingdoms, the eastern half, centered on Constantinople, continued as what historians call the Byzantine Empire until 1453.

Last updated: August 2026

History Timelines. (August 2026). Fall of Rome Timeline: Key Events and History. Retrieved from https://history-timelines.org.uk/events/fall-of-rome/

This fall of Rome timeline traces the long arc from the empire’s territorial height under Trajan through the crises, invasions, and administrative divisions that culminated in the deposition of its last western emperor in 476. Historians still actively debate both the causes of Rome’s decline and even the precise moment it should be considered “fallen,” since the eastern half of the empire endured for another thousand years.

Fall of Rome Timeline: The Empire at Its Height and First Cracks

In 117, under Emperor Trajan, Roman territory reached its greatest extent, stretching from Britain in the northwest to Mesopotamia in the east and covering an estimated five million square kilometers. Trajan’s successor Hadrian soon abandoned some of the costliest eastern gains, choosing to consolidate rather than continue expanding an already overextended frontier. That tension between ambition and sustainability would recur for centuries. It came to a head in the Crisis of the Third Century, a roughly fifty-year span beginning with the death of Severus Alexander in 235, during which the empire saw around twenty-six recognized emperors, near-constant civil war, currency debasement, and repeated incursions by peoples beyond its borders. The empire survived, but not unchanged: in 285, Emperor Diocletian restructured it into separately governed eastern and western halves, a reform meant to make an empire that had grown too large for one ruler to defend and administer more manageable. Diocletian’s reforms stabilized Roman government for a time, but the underlying pressures on the frontiers — economic strain, army recruitment problems, and the movement of peoples along the Rhine and Danube — did not disappear.

Roman legionary soldiers standing in formation with a fortified frontier wall in the background

Fall of Rome Timeline: Invasions and the Sack of the Eternal City

The frontier pressures Diocletian’s division could not solve boiled over in 378 at the Battle of Adrianople, where Visigothic forces — pushed westward in part by the arrival of the Huns from Central Asia — destroyed a Roman army and killed Emperor Valens, a defeat one contemporary historian compared to the disaster at Cannae centuries earlier. Rome’s vulnerability, once exposed, proved impossible to fully repair. In 410, after years of failed negotiations between the Visigothic leader Alaric and the western imperial court, his forces breached Rome’s walls and occupied the city for three days, plundering its treasury and palaces — the first time Rome itself had fallen to a foreign army in nearly 800 years. Forty-five years later, in 455, the Vandal king Genseric led his forces into Rome with little resistance; despite a reported agreement with Pope Leo I to spare the population from slaughter, the Vandals looted the city for roughly two weeks, an episode that lent the Vandals’ name to acts of willful destruction ever since. Each sack chipped away further at the authority and prestige of a western imperial government that was steadily losing the ability to defend its own capital.

Fall of Rome Timeline: The End in the West and Survival in the East

By the mid-5th century, the Western Roman Empire had lost most of its territory to Germanic kingdoms and depended heavily on foreign generals to command what remained of its armies. That dependence proved decisive in 476, when the Germanic general Odoacer deposed the teenage emperor Romulus Augustulus rather than install another puppet ruler, choosing instead to rule Italy himself. Historians have long treated this as the traditional end date of the Western Roman Empire, though many caution it marked the culmination of a gradual decline rather than a single dramatic collapse — some point to earlier losses of territory as equally significant turning points, and the “fall” is better understood as a process spanning centuries than a single year. Crucially, the fall of the Western Empire was not the end of Rome altogether. The eastern half, governed from Constantinople, survived and evolved into what modern historians call the Byzantine Empire, preserving Roman law, administration, and culture in transformed form until Constantinople itself fell in 1453.

Frequently Asked Questions

When did the Roman Empire fall?

The Western Roman Empire is traditionally dated to have fallen in 476, when Odoacer deposed Emperor Romulus Augustulus, though historians widely agree the decline was a gradual process spanning centuries rather than one single event.

What caused the fall of Rome?

Historians point to a combination of factors including prolonged civil wars, economic and military strain, administrative overreach, and pressure from migrating peoples along the empire's frontiers; there is no single agreed-upon cause, and the topic remains actively debated.

Did the Roman Empire completely disappear in 476?

No — only the western half ended in 476. The eastern half, centered on Constantinople, continued for nearly another thousand years as what historians call the Byzantine Empire, until it fell in 1453.

What was the Crisis of the Third Century?

It was a roughly fifty-year period beginning in 235 marked by rapid imperial turnover, civil war, and frontier invasions that severely destabilized the Roman Empire before Diocletian's later reforms helped restore order.