Colosseum Facts That Change How You See It

The Colosseum is one of the most photographed buildings on earth and one of the most confidently misdescribed. Some of what everyone knows is right, some of it is a Renaissance guess, and one very famous claim is openly contested by the reference works.

Here is what the record actually supports, drawn from the World History Encyclopedia and Britannica.

When was the Colosseum built, and by whom?

Construction began between 70 and 72 CE under Vespasian, the first of the Flavian emperors, which is why its Roman name was the Amphitheatrum Flavium. Titus dedicated it in 80 CE with a hundred days of games. Domitian added the top story in 82 CE.

Three emperors, roughly a decade, one building. It hosted public spectacles from 80 CE to 404 CE, which is a working life of over three hundred years.

Why was it built on a lake?

Because of who owned the lake. The site was the artificial lake at the center of Nero's Golden House, a private palace complex in the middle of Rome. Vespasian drained it and put a public amphitheater on top.

Britannica describes the decision as symbolic as much as practical, and it is hard to read it any other way. Vespasian came to power after the chaos of 69 CE with no great pedigree behind him, and replacing a hated emperor's private water feature with fifty thousand public seats made an argument no speech could.

As a precaution against earthquakes, the foundations went down six meters in concrete. On drained lakebed, that was not optional.

How big is it really?

Measure	Figure
Overall footprint	189 by 156 meters (620 by 513 feet)
Height	45 meters, about 150 feet, over four stories
Arena floor	87.5 by 54.8 meters
Capacity	About 50,000, roughly 45,000 seated and 5,000 standing
Entrances	80, of which 76 were numbered and ticketed

The materials are worth knowing too, because they are not uniform. The main frame and facade are travertine, the secondary walls volcanic tufa, and the inner bowl and vaults concrete. Heavy stone where load is carried, light pumice in the vaults.

Was it named after its size?

Probably not. The likelier origin is the Colossus, an enormous gilded bronze statue of Nero that stood beside the building, later reworked to look like the sun god. It remained there into the fourth century.

So the name may commemorate a statue nobody can see any more, attached to a building everybody can. The size explanation is plausible enough that it survives, but the statue was literally called the Colossus and literally stood next to it.

What makes it an engineering achievement?

That it stands on its own. Britannica makes the point plainly: earlier amphitheaters were almost all cut into convenient hillsides, which let the ground carry the weight of the seating. The Colosseum is freestanding, built on a system of barrel and groin vaults.

That is the difference between hollowing something out and holding something up. Every tier of seats above the arena floor is supported by the structure itself, which is why the ruin still reads as architecture rather than as a quarry face.

The three tiers of arcades carry Doric, Ionic and Corinthian columns in ascending order. That stacking later became the Renaissance rule known as the assemblage of orders, which means the building taught architects how to design for the next fifteen hundred years.

How did fifty thousand people get in and out?

Through eighty entrances, seventy-six of them numbered, with tickets sold for each. Staircases and landings were numbered too, and seats were numbered within them. It is a modern stadium system, arrived at roughly two thousand years early.

Two further entrances belonged to the fighters. The Porta Libitina, named for the goddess of death, was where the dead were carried out. The Porta Sanivivaria was where the living left. The last two doors were for the emperor.

Who sat where?

Strictly by rank, and the further from the sand you sat, the less you counted. A marble terrace ringed the arena with boxes for the emperor and dignitaries. Beyond that, marble seating divided into zones for wealthy citizens, then middle-class citizens, then slaves and foreigners.

At the top, under a flat-roofed colonnade, were wooden seats and standing room for women and the poor. Above them, on the roof platform, sailors worked the rigging of the velarium, the retractable awning that shaded the crowd. Britannica notes it took hundreds of them.

So the building was a diagram of Roman society, and everyone attending could see exactly where they stood in it.

What was under the arena floor?

A maze of small rooms, corridors and animal pens, still visible today. It also held lifting mechanisms that could introduce animals into the arena suddenly, from below, which is a stage effect rather than a practical arrangement.

The floor above was landscaped for the occasion, dressed with rocks and trees to suggest somewhere exotic during the animal hunts. At the opening shows, it was flooded for mock naval battles.

That combination, a sand floor over a working basement of machinery, is closer to a theater than to a sports ground.

Were Christians really martyred there?

Here the two reference works disagree, and it is worth seeing the disagreement rather than picking a side. The World History Encyclopedia describes the Colosseum as the scene of many executions during the lunchtime lull, particularly of Christian martyrs.

Britannica states that despite popular belief, it is uncertain whether the arena was the site of the martyrdom of early Christians.

Both are serious sources. What is not in doubt is that public executions happened there, that the association became central to how the building was understood later, and that in 1744 Pope Benedict XIV consecrated it in memory of the martyrs and banned further removal of its stone. The consecration is a fact. What it commemorates is contested.

What happened to it after the games stopped?

Emperor Honorius abolished the games in 404 CE, though condemned criminals were still made to fight animals for roughly another century. After that the building had a long, undignified middle age.

Earthquake damage in 422, repairs in 467, 472 and 508. A fortress for the Frangipani and Annibaldi families in the twelfth century. A major earthquake in 1231 brought down the southwest facade, and from then on it was a stone quarry, with iron clamps stolen and statues melted for lime. Pope Alexander VI leased it out as one.

The strangest chapter is botanical. In 1844 Richard Deakin cataloged more than 420 plant varieties growing in the ruin, some rare, some found nowhere else locally, possibly descended from seed that arrived in the food of animals shipped in for the games. The building outlived its purpose by so long that it became an ecosystem.

Why does it still work as an image?

Because it is a ruin that still explains itself. You can stand in it and read the seating order, the entrances, the machinery under the floor. Very few ancient buildings let you do that, which is why it carries so well on a wall.

1. Aerial and interior views read very differently. Aerial shows the plan; interior shows the scale.
2. Give a Colosseum piece a plain wall. The architecture is already busy.
3. Go one size larger than feels right. Small architectural prints read as souvenirs.
4. Warm stone tones sit well against off-white, bone and deep olive walls, and badly against cold gray.

The pieces that use it are collected in the Man in the Arena wall art collection. For why the building became a metaphor at all, the Man in the Arena speech is the short answer, and what a gladiator actually was covers what happened on the sand.