Vespasian’s grand undertaking

When Vespasian took power in 69 CE, he assumed a throne no one trusted.

He had won it through military force, after a year of civil war. He wasn’t from an old aristocratic family. He had no hereditary claim. And Rome was exhausted—financially drained, politically fractured, and deeply skeptical of emperors after watching Nero’s self-indulgent reign, and the short reigns of several upstarts.

He needed to prove that he was different.

The Colosseum was part of how he did it.

Nero and the End of the Julio-Claudian Dynasty

For nearly a century after Augustus established imperial rule, Rome had grown accustomed to the idea that the emperor always came from the same extended family. Augustus. Tiberius. Caligula. Claudius. Nero.

It wasn’t a formal dynasty, and no one pretended succession was clean or purely hereditary. But it had been contained to a single—albeit loose—family line through a combination of blood ties, marriage, backroom politics, strategic adoptions, and occasionally violence. And since the arrangement held, Romans came to expect that emperors emerged from this family.

By the time Nero took power in 54 CE, cracks were showing. Caligula had been assassinated by his own guards. Claudius may well have been poisoned (possibly by his wife, Nero’s mother). Transitions were becoming more tense—but the system kept limping forward.

Nero and his mother changed that.

Nero was the son of Agrippina the Younger, a woman with impeccable lineage and incredible ambition. She was Augustus’s great-granddaughter and Caligula’s sister. By the time Nero was eleven, Agrippina had managed to marry her uncle, Emperor Claudius, and become empress herself.
From there, she moved fast. She engineered Nero’s adoption as Claudius’s imperial heir, pushing aside Claudius’s younger biological son, Britannicus. When Claudius died suddenly in 54 CE, Agrippina controlled a smooth transition for the sixteen-year-old Nero to become emperor, exercising extraordinary influence at the beginning of Nero’s reigh, at times acting almost as his co-ruler.

For a brief moment, Rome saw something unprecedented. Coins and official imagery showed mother and son together. Agrippina is alleged to have worn imperial colors, appeared at state ceremonies, and walked beside Nero in public. Powerful women weren’t new. Powerful women who looked like co-rulers were. To Rome’s male elite, this was deeply unsettling, and brought Nero’s political competence into question.

As Nero grew older, he wanted out from under his mother’s control. What followed in his attempts to break away was neither clean nor subtle. Ancient sources describe a series of failed assassination attempts: botched poisonings, a ceiling designed to collapse at night, even an elaborately designed pleasure boat engineered to sink at sea.

Eventually, Nero had her killed by armed men, though the precise circumstances are uncertain. The elaborate assassination attempts described by ancient writers may owe as much to storytelling as to fact.
With Agrippina gone, Nero removed the strongest check on his authority — and, many ancient writers suggest, on his behavior. Even former supporters were shaken. The murder became shorthand for everything Romans found disturbing about his reign: cruelty, excess, and contempt for the people he was supposed to care about.

What followed didn’t help. Nero was accused of becoming increasingly withdrawn from the work of governing. He sidelined experienced advisors like Seneca and elevated men who indulged his worst instincts. He treated the Senate with open hostility, executing senators on flimsy charges. His monetary reform reduced the precious-metal content of coins, debasing the value of currency. He grew increasingly suspicious, erratic, and paranoid.

And instead of projecting the image Romans expected from an emperor — military leadership, restraint, dignity — Nero did the opposite. He took the stage as a performer. He sang, acted, competed in public contests. He surrounded himself with actors, musicians, and dancers. While this increased his popularity with ordinary Romans, it infuriated much of Rome’s senatorial elite. To them, this wasn’t charming. It was disgraceful.

After the Great Fire of Rome in 64 CE, public anger boiled over. Even though Nero was away from Rome when the fire started, rumors nevertheless spread that Nero had caused the fire, and failed to respond to help Romans deal with the aftermath. His decision to build the Domus Aurea — an enormous palace complex — on land cleared by the disaster made those rumors harder to dispel. To many, it looked like a ruler using catastrophe as an opportunity for self-indulgence.

In 65 CE, the Pisonian Conspiracy nearly ended his reign. When it failed, ancient writers describe a shift in Rome: punishments grew harsher. Informers multiplied. Minor offenses suddenly carried deadly consequences.
By 68 CE, even the Senate and provincial armies had had enough. Rebellion broke out in Gaul—on the anniversary of the death of Nero’s mother—and quickly spread. The Senate moved to declare Nero a public enemy. Abandoned by the Praetorian Guard, Nero fled Rome and took his own life.

With him, the Julio-Claudian dynasty ended.

Civil War Erupted Immediately

When Nero died, he left Rome without an heir, without any remaining Julio-Claudian legitimacy, and without a clear succession plan. For the first time in nearly a century, there was no obvious answer to the question of who should rule next.

Imperial Rome had never developed a formal system for choosing a new emperor once a ruling family collapsed. When Augustus established the empire after the fall of the Republic, he deliberately avoided creating a monarchy. Instead, he relied on a delicate balance of titles and authority that worked only as long as his family held together and could decide who inherited those powers next. That arrangement held for decades—and no one prepared for the moment when there was no one left in line.

When the moment came, chaos erupted. Over the next twelve months, four men tried to establish themselves as emperor.

Three failed.

The Year of the Four Emperors

Vespasian’s Legitimacy Problem

Unlike the emperors before him, Vespasian did not come from Rome’s old aristocracy. His family background was respectable but modest: tax collectors, minor officials, and equestrian administrators, not ancient senatorial lineages. He had risen through the senatorial career via provincial office and military command, but without the ancestral prestige of Rome’s oldest aristocratic houses. No one could point to ancestral prestige, dynastic continuity, or long-standing senatorial dominance to explain why he should be emperor.

Just as importantly, Vespasian had come to power by bypassing Rome’s traditional institutions. The Senate did not elevate him first; it ratified him after the fact. His authority rested on military backing; Rome’s political institutions formalized it afterward.

If Vespasian wanted to last, he needed to be seen as something more than the latest winner of a military contest. That meant demonstrating that his rule would restore stability rather than perpetuate crisis.

The Solution: Give It Back

Nero’s Domus Aurea—sprawling, private, and built in the heart of Rome—had become a symbol of everything people feared about unchecked imperial power. Vespasian’s strategy was straightforward: dismantle Nero’s palace and return the land to the people.

He started immediately. Vespasian began reclaiming Nero’s private complex for public use. The artificial lake was drained, and on its site he began the Flavian Amphitheatre, the largest public amphitheater the city of Rome had ever seen. Over the following decades, other parts of the Domus Aurea were stripped, buried, or built over.

The amphitheatre was financed at least in substantial part from the spoils of the Jewish War. The building’s own inscription says it was constructed ex manubiis—‘from the spoils’—of the destruction of Jerusalem. This not only advertised Flavian military victory but also presented the new emperor as using that victory for public benefit rather than private luxury.

Vespasian died a year before the Colosseum was completed. His son Titus completed construction and held 100 days of games to celebrate the amphitheater’s opening.

Why It Worked

First, it erased a hated symbol. Nero’s palace was gone, replaced by something built explicitly for public use.

Second, it demonstrated competence. Building something this massive required engineering expertise, organizational skill, and enormous resources. It showed that Vespasian could manage the empire effectively.

Third, it created a tangible benefit for ordinary Romans. The Colosseum wasn’t just symbolic—it provided entertainment. And in Rome, keeping the population entertained went a long way toward keeping the population loyal.

As aedile, Caesar staged 320 pairs of gladiators and spent so lavishly on games and public feasts that, as Plutarch records, he “threw into the shade all the attempts that had been made before him,” winning the crowd’s favor so thoroughly that Romans began inventing new offices and honors for him.

Plutarch, Life of Caesar

This strategy, combined with other reforms, helped Vespasian secure the legitimacy he needed. He ruled for ten years, dying not at the hand of a challenger or usurper, but of natural causes. His son Titus succeeded him peacefully as the second in the Flavian dynasty. Titus inaugurated the Colosseum, and ruled for two more years before dying (also of natural causes, though there were rumors). His brother Domitian took power and ruled for another fifteen years.