Who Built the Colosseum?

The Colosseum was built by the Flavian dynasty of Roman emperors between roughly 70 and 80 CE, with later modifications continuing under Domitian until about 96 CE. The project was begun by Vespasian, inaugurated by his son Titus, and completed by his younger son Domitian. The massive arena was financed largely by the spoils of the Jewish War, including the treasure of the Temple of Jerusalem, and it stood as both a political monument and the largest amphitheater the Roman world would ever see. For the cultural context of the games held there, see Roman Entertainment.

A Dynasty’s Signature Project

The Flavian dynasty took its name from Vespasian’s family, the Flavii, and the Colosseum — originally called the Amphitheatrum Flavium — was meant to be the dynasty’s signature monument, just as Augustus had the Forum of Augustus and Nero the Domus Aurea. Construction began in 70 or 72 CE, after Vespasian had returned from the civil war of 69 CE, the so-called Year of the Four Emperors. By choosing the drained basin of Nero’s enormous artificial lake as the building site, Vespasian symbolically returned that land to the people of Rome, replacing one emperor’s private pleasure garden with a public arena. The full dynasty is explored in The Flavian Dynasty.

Vespasian: The Founder (70–79 CE)

Vespasian ruled from 69 to 79 CE and laid the foundations of the Colosseum. He was a pragmatic former general from a relatively modest Italian family who had risen to power only after a year of civil war. Vespasian understood that legitimacy in Rome came from visible public works and popular generosity, and the Colosseum was the centerpiece of a broader program of restoration following the chaos of 69 CE. He died in 79 CE, before the building was finished, but the structure that bears the Flavian name was his vision.

Titus: The Inaugurator (79–81 CE)

Vespasian’s elder son Titus completed the upper stories and inaugurated the Colosseum in 80 CE with a hundred days of games that became legendary. According to the poet Martial, the spectacles included 9,000 animals killed in the opening weeks alone, along with mock naval battles in the flooded arena, gladiatorial combats, and executions of condemned criminals. The inaugural games coincided with the dedication of Titus’s triumphal arch on the nearby Via Sacra, celebrating his victory in the Jewish War of 66–73 CE. Titus himself died barely two years later, in 81 CE, probably of fever caught at the eruption of Vesuvius, but the building he opened would outlive the dynasty by fifteen centuries.

Domitian: The Improver (81–96 CE)

Domitian, the younger brother, completed the Colosseum’s final form. He added the hypogeum, the underground labyrinth of tunnels and animal lifts that still astonishes visitors today, and he modified the seating to create a privileged section at the top for the equestrian order and a marble box for the Vestal Virgins. He also added the top gallery, raised the outer wall, and built the arena’s underground mechanisms that allowed elaborate scenic effects. Domitian’s final changes made the Colosseum not just a stadium but a theater of unprecedented mechanical sophistication.

The Spoils of Jerusalem

Crucially, the project was funded by the sack of Jerusalem in 70 CE. After a brutal four-month siege, Titus’s army breached the walls of the Temple Mount, looted the Second Temple of its sacred vessels, and destroyed the sanctuary itself. The treasures — including the seven-branched menorah, the Table of Showbread, and the silver trumpets — were carried to Rome and displayed in Titus’s triumph, then later deposited in the Temple of Peace. Vespasian used part of this enormous windfall to begin the Colosseum, an act that bound the Flavians’ claim to rule to the conquest of the Jewish people and to a tangible gift to the Roman people.

A Capacity of 50,000 to 80,000

The finished building could hold an estimated 50,000 to 80,000 spectators, making it the largest amphitheater ever built in the Roman world. Spectators entered through 80 numbered vomitoria and were seated according to a strict hierarchy: senators and magistrates in the front rows, equestrians above, ordinary citizens higher still, and women and slaves near the top. The outer wall stood about 48 meters tall, and the great awning known as the velarium, manipulated by sailors from the nearby river port of Ostia, could shade the crowd from the Italian sun. Modern scholars continue to debate the exact capacity, but no Roman building of any kind ever seated as many people in one place.

The Name “Colosseum”

The building was not called the Colosseum in antiquity. That popular name derived either from the colossal bronze statue of Nero that stood beside it, later transformed into a representation of the sun god Sol, or from the sheer colossal size of the structure. Medieval pilgrims and visitors gradually adopted the nickname, and by the Middle Ages the original Amphitheatrum Flavium had been forgotten in favor of the more memorable Colosseum.