Who built the Colosseum, and why? Facts, history, and how 50,000 people got in and out

Architecture · 4 September 2026

The Colosseum was built by the emperor Vespasian, who began it in AD 72, and finished by his son Titus, who opened it in AD 80 with a hundred days of games; his younger son Domitian added the top storey and the basement. It was built on the site of the artificial lake of Nero's Golden House, which the new dynasty drained to give the ground back to the people, and it was paid for with the spoils of the Jewish War of AD 70, which also supplied prisoners for the labour. Its proper name is the Flavian Amphitheatre; "Colosseum" comes from the colossal bronze statue of Nero that stood beside it. It held about 50,000 people, staged gladiator fights, animal hunts and executions for 450 years, and lost two thirds of its stone to earthquakes and to the builders of Renaissance Rome. Below: the builders and their reasons, the construction, the engineering of the crowd, what happened inside, the later history, and a separate section for the myths.

Who built it and why

Vespasian came to power in AD 69 after the civil war that followed Nero's suicide. Nero had taken a third of the centre of Rome for his Golden House, a palace with a private lake where the Colosseum now stands, and the new emperor, a general of modest birth, needed to show that the Flavians returned the city to its people. An amphitheatre was the ideal gift: Rome, unlike the provincial cities, had only a temporary wooden one. The money came from the sack of Jerusalem in AD 70 by Titus: a reconstructed dedication inscription reads that the emperor "ordered the new amphitheatre to be made from the spoils", and the treasure of the Temple, paraded in the triumph shown on the Arch of Titus, is generally understood to have paid for it. Tens of thousands of Jewish prisoners were brought to Rome and are assumed to have worked on the site alongside professional Roman builders and engineers. Colosseum overview.

How it was built

• The site. Nero's lake was drained and a concrete ring foundation 40 feet (12 m) deep and 170 feet (52 m) wide was poured into the wet clay, the largest foundation of antiquity.
• The skeleton. Eighty radial walls of travertine limestone, quarried at Tivoli 20 miles away and brought on a purpose-built road, rise as piers from the foundation; they are joined by concrete vaults faced in brick and tufa that carry the seating. About 100,000 cubic metres of travertine were used, held by 300 tons of iron clamps, whose sockets are the holes that pock the walls today.
• The facade. Four storeys, 157 feet (48 m) high: three arcades of 80 arches each, framed by Doric, Ionic and Corinthian half-columns, and an attic with Corinthian pilasters and 240 brackets for the masts of the velarium, the awning that sailors from the fleet at Misenum rigged over the crowd.
• Materials. Travertine outside and for the piers, tufa for the inner walls, brick-faced concrete for the vaults, marble for the seats and the emperor's box, wood for the arena floor.
• Time. About eight years for the main structure, AD 72 to 80, with several thousand workers; Domitian added the hypogeum, the basement, and the top tier by about AD 85.

How 50,000 people moved

The building is a machine for crowds. Its 80 ground-floor arches were numbered, and every spectator held a ticket, a pottery shard, with the number of the entrance, the tier and the row; four unnumbered arches on the axes were for the emperor, the magistrates and the performers. From the entrances a system of stairs and ringed corridors, the vomitoria, led each class to its seats: senators on marble in the front rows, knights above them, citizens above, and at the top, under the awning, women, slaves and the poor on wooden benches. The whole building could fill or empty in a matter of minutes, and the layout is still the model for stadium design. Below the arena, Domitian's hypogeum held two storeys of cages, ramps and about 28 lifts worked by winches, which raised animals and scenery through trapdoors in the wooden floor.

What happened inside

A day at the games had a programme. The morning was animal hunts, venationes, with lions, bears, elephants, crocodiles and rhinoceros brought from across the empire; at the inaugural games in AD 80 about 9,000 animals were killed. Midday was executions, often staged as myths, with the condemned playing the dying hero. The afternoon was the gladiators, trained professionals fighting in pairs by type, with a referee, and dying far less often than films suggest, since a trained fighter was expensive; perhaps one in five bouts ended in death. The inaugural games included, according to Cassius Dio, a naval battle, which would mean the arena was flooded; that was possible only before the hypogeum was built, and drains found under the arena suggest it was done. Gladiator games ended around AD 435 and animal hunts in 523, after which the building was left to itself.

What destroyed it

Two thirds of the Colosseum is gone, and the shape of what remains, high on the north side and low on the south, shows why. Earthquakes in 443, 847 and, above all, 1349 brought down the outer wall on the south, which stood on the softer, filled ground of Nero's lake. The fallen travertine was then quarried for four centuries: it went into the Palazzo Venezia, the Palazzo Farnese, the Cancelleria and the steps of St Peter's, and the iron clamps were dug out of the walls to be melted down. In the Middle Ages the arcades held workshops and houses and the Frangipane family fortified it; in 1749 Pope Benedict XIV declared it sacred to the Christian martyrs, which stopped the quarrying, although there is no evidence that Christians were martyred in it rather than in the Circus. Restorations began in the 1800s and continue.

Versions and myths

Everything below is a version, not a fact. These are the claims that appear in search next to "who built the Colosseum", each with who made it and what the evidence says.

Christians were fed to the lions in the Colosseum

Version. The tradition behind the papal declaration of 1749 and a thousand paintings. Reply. Christians were certainly executed in Rome, but no ancient source places a martyrdom in the Colosseum; the early martyrs of Rome died in the Circus of Nero and elsewhere. The story grew in the 16th and 17th centuries.

Thumbs down meant death

Version. The gesture in Gérôme's 1872 painting "Pollice Verso" and every film since. Reply. The sources say the crowd used a "turned thumb" to demand death, but not which way it turned; some scholars think a thumb up or a thumb thrust out was the death signal and a closed fist the reprieve.

Gladiators always fought to the death

Version. The film image. Reply. Gladiators were valuable trained slaves or paid volunteers; most bouts ended with a submission, and inscriptions record men with dozens of fights. Death in the arena was for the condemned and for animals.

The name comes from its size

Version. "Colosseum" because it is colossal. Reply. The name, first recorded around AD 1000, comes from the Colossus of Nero, a 100-foot bronze statue that stood beside the amphitheatre until at least the 4th century; the Romans called the building the Flavian Amphitheatre.

It was built by slaves alone, or by aliens

Version. The usual pair. Reply. Prisoners of the Jewish War did unskilled labour, but the design, the vaults and the stonework were the work of Roman engineers and masons whose methods are documented on dozens of other amphitheatres, from Nîmes to El Jem.

What is in the archive

The Colosseum is in the Buildings by style collection with the other works of Roman engineering: the Pantheon, the Baths of Caracalla, the Pont du Gard and the Arch of Constantine, which stands beside it and was built from pieces of earlier monuments. How the Romans built is in Roman architecture.

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