When Was the Colosseum Built? Construction Timeline & History

Construction of the Colosseum began under Emperor Vespasian around AD 70–72. His son Titus opened the amphitheatre in AD 80, and Domitian completed major additions soon afterwards, including the underground hypogeum and work on the upper levels. So the short answer is: about eight years to reach the opening, followed by further construction under the next Flavian emperor.

When was the Colosseum built?

The standard chronology places the start of construction in the early 70s AD, during the reign of Vespasian. The amphitheatre was inaugurated by Titus in AD 80. Domitian, who became emperor in AD 81, then oversaw important additions that changed how the building worked, especially below the arena floor.

That distinction matters because there is no single moment when every part of the Colosseum was finished. AD 80 is the key date for the opening, while the structure continued to evolve in the years immediately afterwards.

A short Colosseum construction timeline

Around AD 70–72: Vespasian begins construction

Vespasian started the amphitheatre in the valley between the Palatine, Esquiline and Caelian hills. The site had formed part of Nero’s enormous palace complex, the Domus Aurea, and included an artificial lake. Building a public amphitheatre there had a strong political message: land associated with an emperor’s private luxury was being returned to public use.

The project was technically ambitious. The builders had to prepare the low-lying site, create massive foundations and organize a structure capable of holding tens of thousands of spectators while moving them efficiently through multiple entrances, corridors and stairways.

AD 80: Titus opens the Colosseum

Vespasian died in AD 79 before seeing the amphitheatre officially opened. His son Titus inaugurated it in AD 80 with a long series of public spectacles. At this stage, the building was already recognizable as the great amphitheatre we know today, although important work still remained.

AD 81–96: Domitian adds the hypogeum and completes major works

Under Domitian, the third Flavian emperor, major changes were made beneath and above the arena. The hypogeum — the network of corridors, service rooms and animal holding areas visible today — belongs to this later phase rather than to the original opening arrangement. Work was also carried out on the upper parts of the amphitheatre.

How long did it take to build the Colosseum?

If you measure from the start of construction under Vespasian to the inauguration under Titus, the answer is roughly eight to ten years. That is remarkably fast for a building of this size and complexity. But it is more accurate to think of the Colosseum as a project completed in phases: first the main amphitheatre, then major additions under Domitian.

The building was also repaired and altered many times after the Flavian period, so the monument visible today is the result of nearly two millennia of construction, damage, reuse and restoration.

Who built the Colosseum?

Three emperors of the Flavian dynasty are central to the construction story. Vespasian initiated the project. Titus completed enough of it to open the amphitheatre in AD 80. Domitian added major features, especially the hypogeum. This is why the ancient name of the building is the Flavian Amphitheatre.

Why was the Colosseum built?

The Colosseum was built as a permanent venue for large public spectacles in the heart of Rome. These included gladiatorial contests, animal hunts and other forms of entertainment. The project also served a political purpose: the Flavian emperors associated themselves with public space and civic generosity after the reign of Nero.

Its location was part of that message. The amphitheatre occupied ground connected with Nero’s private palace landscape, turning a symbol of imperial privilege into a monumental venue for the Roman public.

Was the underground hypogeum part of the original Colosseum?

Not in the form that survives today. The elaborate underground complex was added after the amphitheatre had opened, mainly under Domitian. It contained corridors, service areas and spaces used to manage people, animals and scenery beneath the arena floor.

This is one reason the early history of the arena can be confusing: the Colosseum of AD 80 was not identical to the Colosseum of the later first century. The building evolved very quickly after its inauguration.

What happened to the Colosseum after antiquity?

The amphitheatre suffered fires, earthquakes and centuries of reuse. A serious fire in AD 217 led to extensive repairs. In the medieval period, earthquakes damaged large sections of the outer structure, and stone from the monument was reused elsewhere in Rome. Later popes and governments carried out stabilization and restoration projects.

The missing section of the outer ring is therefore not evidence that the Colosseum was left unfinished. Much of the loss happened long after construction, especially through earthquake damage and the reuse of fallen or accessible building material.

What can you still see from the original construction?

Visitors can still read the original engineering in the surviving travertine façade, the arches, internal circulation routes and the vast supporting structure around the arena. The exposed hypogeum is historically important too, but remember that it belongs mainly to the post-opening phase under Domitian.

The monument also contains visible traces of later repairs. Different brickwork, rebuilt sections and structural reinforcements reflect centuries of damage and restoration rather than a single untouched Roman phase.

Frequently asked questions

What year was the Colosseum completed?

AD 80 is the main date because that is when Titus inaugurated the amphitheatre. Major additions continued under Domitian, so historians usually distinguish the opening from the final Flavian building phases.

How old is the Colosseum?

The Colosseum is nearly 2,000 years old. Its inauguration in AD 80 makes it one of the best-known surviving monuments of imperial Rome.

Why is it called the Flavian Amphitheatre?

Because it was built under the Flavian dynasty: Vespasian, Titus and Domitian. “Colosseum” became the more familiar later name.

Why is part of the outer wall missing?

Large sections were damaged by earthquakes and later reused as a source of building material. The missing outer ring is not part of the original design.

Sources and editorial note

This page focuses on the construction chronology rather than current ticket products. The dates above follow the standard historical chronology used by the Parco archeologico del Colosseo and major reference works on the Flavian Amphitheatre. Where scholars debate details of individual phases, we avoid presenting a disputed reconstruction as a settled fact.

Planning a visit

If you are planning to visit rather than researching the construction history, see our separate guide to Colosseum tours, access types and booking options. Keeping the practical booking information separate lets this page stay focused on the history of the building.