Who Were The Frumentarii?

Two millennia before MI5, the CIA and the KGB, the labyrinthine corridors of power in Ancient Rome were home to a myriad of agents and operatives who ensured the Empire's vast machinery ran smoothly and trouble-free, but who were the frumentarii? From simple wheat collectors to shadowy Roman spies. Read on to find out.

1 November 2023

In the fascinatingly complex history of ancient Rome, the frumentarii resonates with intrigue and secrecy. This enigmatic group, often whispered about but seldom in the full light of historical record, played a critical role as the Empire’s intelligence apparatus.

Believed to have gained influence under the watchful eye of Emperor Domitian, what was in effect a Roman secret police force started as a team of supply officers responsible for procuring wheat. But as the needs of the Empire evolved and the complexities of governance grew, so too did their roles. They became informers, intelligence gatherers and spies.

But who were the frumentarii? What were they tasked to do? Were they merely the eyes and ears of the administration, keeping tabs on what was happening, or was their sphere of operation altogether more sinister?

Here is the astonishing story of Rome’s secret service.

The Beginning of the Frumentarii

Domitian, believed to have been behind the creation of the Frumentarii. (Credit: duncan1890 via Getty Images)

Intelligence gathering is as old as human conflict and diplomacy itself. Ancient civilisations, from the Egyptians to the Chinese, recognised the value of information. Sun Tzu’s The Art of War, written around the fifth century BC, underscores the importance of espionage, suggesting that effective intelligence gathering has always been paramount to strategic decision-making. As societies grew more complex and conflicts more multifaceted, methods of intelligence collection evolved.

The frumentarii may have been established by Roman emperor Domitian in the first century AD, although the first written records of their existence appear after his reign, sometime in the early second century.

It’s believed their original function was what we recognise today as logistics. They collected, delivered and distributed grain – frumentum – to Rome’s troops, as well as relaying messages to and from Rome and the outlying provinces. But soon, their remit expanded. They became couriers, tax collectors, policemen, and spies.

Over time, the frumentarii became the eyes and ears of the Roman administration, monitoring the provinces, keeping tabs on provincial governors, military commanders, and even senators, and even weeding out potential rebellions. Their covert operations, combined with their deep penetration into both the civil and military spheres, made them both revered and feared, a potent tool for emperors seeking to solidify control and manage the sprawling territories of Rome.

Based first at the Castra Peregrina on the Caelian Hill, one of Rome’s famous seven hills, they were later centralised under Emperor Trajan.

The Eyes and Ears of Rome

Emperor Hadrian (Credit: Grafissimo via Getty Images)

From humble origins as logistics officers, it was during the reign of Hadrian – as the Empire expanded and became more intricate – that saw the role of Rome’s secret service evolve into a more intelligence-oriented one.

In Hadrian’s biography in the collection of Roman biographies known as Historia Augusta, it says ‘[Hadrian’s] vigilance was not confined to his own household but extended to those of his friends, and by means of his private agents (frumentarii) he even pried into all their secrets, and so skilfully that they were never aware that the Emperor was acquainted with their private lives until he revealed it himself.’

Their close relationship with the military and their logistical work across the empire made the frumentarii invaluable assets for intelligence gathering. They operated as couriers, carrying messages and reports between the frontier and Rome. Over time, they evolved into the Roman secret police, acting as the eyes and ears of the emperor across the vast expanse of the empire.

These Roman spies infiltrated communities, gathering information that would be of use to the emperor. They would often hide in plain sight, mingling inconspicuously with the people of Rome, frequenting bathhouses, inns and other social environments for any tidbits of gossip. They would befriend authors, philosophers, historians and publishers to find out what people thought of the emperor.

The Frumentarii were also instrumental in identifying and arresting those deemed enemies of the state. Imprisonment, torture, and execution were tools at their disposal, and they used them to quash opposition. Their reach is also believed to have extended to political assassinations, ensuring threats to the throne were neutralised.

Rule by Fear

The extensive powers and secrecy surrounding what was effectively the Roman secret service made them both a valuable asset and a potential liability. While they were tools of the emperor, their influence and autonomy made them feared across the empire.

Many Romans, including those in powerful positions, were wary of the frumentarii, knowing that they operated in the shadows, often beyond reproach or accountability. This duality of being both protectors of the empire and potential threats to individual freedoms marked their evolution into one of the most potent and feared organisations in ancient Rome.

In time, they came to be detested by the citizens of Rome. Abuses of power including false and arbitrary accusations and arrests were seen as the tyrannical acts of an abusive and controlling empire, and the Roman secret police were seen as a plague on society.

The Downfall of Rome’s Secret Service

Diocletian, credited for the dissolution of the frumentarii. (Credit: mikroman6 via Getty Images)

The dissolution of the frumentarii is largely credited to Emperor Diocletian, who reigned from 284 to 305 AD. Their downfall was a combination of their increasing unpopularity, instances of abuses of power, and political shifts within the Empire. Their extensive influence and the fear they instilled made them targets for reforms, especially as they often operated with unchecked power, leading to the potential for corruption and misuse of authority.

Diocletian was known as a reformer who wanted to stabilise an empire facing both external pressures and internal decay. These Roman spies, with their widespread influence, were seen as a liability in this new system. Their secretive nature and potential to challenge the emperor’s authority made them unsuitable for Diocletian’s vision of a more balanced and structured administration.

When the frumentarii were disbanded, they didn’t disappear completely, rather their roles and responsibilities were absorbed into agentes in rebus (translated roughly as ‘those involved in matters’), a similar agency who took on various administrative, diplomatic, and intelligence roles within the empire but were kept on a tighter leash than their predecessors.

While the agentes in rebus served many functions similar to the frumentarii, their organisation and accountability structures were designed to prevent the excesses and potential challenges to imperial power that had marked the latter stages of the frumentarii’s existence.

Qui Custodiet Ipsos Custodes: Who Watches the Watchmen

A watchtower glows amidst a starry sky. (Credit: Cavan Images via Getty Images)

The frumentarii, Rome’s secret service, emerging from the origins of grain procurement, evolved into one of ancient Rome’s most formidable intelligence apparatuses, weaving a web of intrigue, espionage, and power dynamics throughout the empire.

Their history, from guardians of the state to potential threats to its balance of power, underscores the intricate fragility between governance, secrecy, and the ever-present quest for control. Their dissolution, giving way to more structured entities, serves as a testament to the changing tides of Roman political vision and the eternal challenge of balancing security with unchecked authority.


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