The Colosseum is almost 2,000 years old and still the largest amphitheatre ever built. It was a political gift, an engineering marvel and a killing ground — then a quarry, a fortress, a church site and finally a world icon. This is the short, accurate version of its history, with the details you will want to spot on your visit.
When was the Colosseum built — and why?
Construction began around 70–72 AD under Vespasian, the first emperor of the Flavian dynasty, on the site of the artificial lake of Nero’s Golden House. The message was political: Vespasian returned land seized by a hated emperor to the people of Rome, in the form of free entertainment. The project was funded largely with spoils from the Jewish War. His son Titus inaugurated it in 80 AD with 100 days of games, and Domitian completed it, adding the top level and the underground.
Who built the Colosseum?
Architects’ names were not recorded, but the workforce combined skilled Roman builders, engineers and large numbers of enslaved labourers. They used travertine for the outer ring, tuff and brick for inner walls, and Roman concrete for the vaults — about 100,000 cubic metres of travertine, held with iron clamps. The holes you see all over the facade are where medieval scavengers dug those clamps out.
What happened inside: gladiators, beasts and sea battles
- Gladiator fights (munera): professional fighters, mostly enslaved men or prisoners, trained in schools such as the Ludus Magnus next door. Not every fight ended in death — trained gladiators were expensive.
- Animal hunts (venationes): lions, bears, elephants and other animals imported from across the empire, raised through the trapdoors of the underground.
- Naval battles (naumachiae): ancient writers describe the arena being flooded for mock sea battles in the early years — before the hypogeum made that impossible.
- Executions of criminals, often staged as myths, were part of the midday programme.
Read also: Colosseum underground tour
How did the Colosseum work?
Eighty numbered entrances let tens of thousands of people in and out quickly through passages called vomitoria. Seating was strictly by social class, from senators near the arena to women and the poor at the top. A huge awning, the velarium, was rigged by sailors to shade the crowd. Below, the hypogeum’s lifts and ramps made animals appear as if by magic.
From arena to icon
| Period | What happened |
|---|---|
| 5th century | Gladiator fights fade out; animal hunts continue |
| 6th century | Last recorded games (around 523 AD) |
| Middle Ages | Housing, workshops, a fortress of the Frangipane family |
| 1349 | A major earthquake brings down part of the southern side |
| 15th–18th c. | Stone reused for palaces and churches; later protected by the popes |
| 19th–20th c. | Excavations and restorations; the hypogeum is uncovered |
| 1980 / 2007 | UNESCO World Heritage (Historic Centre of Rome) / New 7 Wonders of the World |
What did the Colosseum look like originally?
Imagine a gleaming white travertine ellipse with statues in each arch of the second and third levels, painted interiors, marble seating and coloured awnings. The partly rebuilt arena floor and reconstruction panels on site help — but nothing beats a guide pointing out the traces. Our guide to the best Colosseum tours compares the options.
Quick quiz: test yourself before you go
1/4 Which emperor started building the Colosseum?
Vespasian started construction around 70–72 AD; Titus inaugurated it in 80 AD.
2/4 Where does the name « Colosseum » come from?
The name comes from the Colossus of Nero, a huge bronze statue that stood next to it.
3/4 Roughly how many spectators could it hold?
Estimates range from 50,000 to around 65,000 spectators.
4/4 Why are there holes all over the walls?
The holes mark where metal clamps holding the stones were dug out in the Middle Ages.
Frequently asked questions
How old is the Colosseum?
Almost 2,000 years old: it was inaugurated in 80 AD, so it turned 1,946 in 2026.
Were naval battles really held in the Colosseum?
Ancient sources say so for the early years, before the underground was built. After the hypogeum was added, flooding the arena was no longer possible.
Did gladiators always fight to the death?
No. Gladiators were costly to train, and many fights ended with the loser being spared. Deaths did happen, and executions were part of the shows.
Why is part of the Colosseum missing?
Earthquakes (especially in 1349) brought down the southern outer ring, and the fallen stone was reused for buildings across Rome.
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