What did Roman writers actually say about Scotland?
When the Roman army first pushed north, Scotland did not yet exist as a unified nation, and the indigenous peoples left behind no written record of the encounter. Virtually everything we know about their world from contemporary literature comes from Greek and Roman observers looking in from the outside. While these accounts provide invaluable details—recording tribal names, campaign routes, and major battles—they are far from impartial. Ancient historians wrote to flatter patrons, reinforce imperial ideology, and satisfy audiences who expected northern Britain to be a wilderness inhabited by ferocious barbarians. Speeches were routinely invented, and many accounts were compiled decades, or even centuries, after the events took place. Below is a guide to the key surviving texts, what they reveal about Roman Scotland, and how critically we need to read them.
1. Tacitus — Agricola
Written: around AD 98
Describes: Agricola’s governorship, AD 77/78–84
Most important for: Agricola • Caledonians • Roman invasion • Mons Graupius • Calgacus
Tacitus provides our single most detailed narrative of the initial conquest, but his work comes with a major caveat: Gnaeus Julius Agricola was his father-in-law. The Agricola is part history and part family eulogy, designed as much to burnish Agricola’s political legacy in Rome as to record military facts.
Read the complete Agricola in English — Perseus Digital Library
Agricola 10 — What did northern Britain look like?
Tacitus opens with an evocative portrait of northern Britain as an untamed edge of the world, dominated by sea, mountains, and tides that seemed to penetrate deep into the hills. While his account reflects genuine intelligence gathered by Agricola’s fleet—including confirmation that Britain was an island—the description serves a literary purpose as well: the wilder and more remote the terrain appeared to Roman readers, the more heroic Agricola’s achievements seemed.
Read: Agricola 10.
2. Agricola 11 — Who were the people of Britain?
In Chapter 11, Tacitus famously speculates on the origins of Britain’s tribes, pointing to the Caledonians’ reddish hair and large limbs as evidence of Germanic descent. It is vital not to treat this as modern demographic history; Roman writers routinely used climate and physical stereotyping to deduce ethnic origins. What matters here is that it gives us our earliest surviving classical impression of northern Britain’s inhabitants.
Read: Agricola 11.
3. Agricola 18–24 — The Romans move north
These chapters cover the advance northwards, culminating in the fortification of the narrow neck of land between the Forth and the Clyde (notably in Chapter 23). This passage is crucial because it demonstrates that sixty years before the Antonine Wall was constructed, Roman military commanders had already recognised the strategic value of the waist of Scotland as a natural frontier.
Agricola 23 is the key passage for the Forth-Clyde line.
Read: Agricola 18–24, especially 23.
4. Agricola 25 — The invasion of Caledonia
Tacitus now tells us that Agricola opened a new campaign and used both his army and fleet. Roman forces penetrated farther into northern Scotland.
This is some of our best evidence that Agricola’s campaign wasn’t simply an army marching north along roads. The Roman fleet was operating in conjunction with the land forces. Ships could scout the coastline, move supplies and threaten communities far beyond the army’s immediate position.
Tacitus emphasises the psychological impact of seeing Roman soldiers and sailors advancing together.
Read: Agricola 25.
5. Agricola 26–27 — The attack on the Ninth Legion
One of the most dramatic episodes in Agricola concerns Legio IX Hispana — the Ninth Legion.
According to Tacitus, Caledonian forces launched a surprise night attack on the Ninth’s camp. They broke into it. Agricola rushed reinforcements to the scene, and the Romans eventually drove the attackers off.
This is rare literary evidence for a Caledonian offensive against a Roman legion. It also challenges the simple picture of Agricola relentlessly advancing while the Caledonians merely retreated. They were capable of intelligence gathering, concentration of forces and a coordinated attack on a Roman camp.
Read: Agricola 26–27.
6. Agricola 29 — The Caledonians gather
The following campaigning season brings us to the most famous episode in Roman Scotland. Tacitus says the Caledonians assembled a very large force under Calgacus. He presents Calgacus as one of several leaders, but as particularly distinguished by courage and status. Then Tacitus gives him a speech.
7. Agricola 30–32 — The speech of Calgacus
This is probably the most famous piece of writing about Roman Scotland.
Tacitus puts an extraordinary denunciation of Roman imperialism into the mouth of Calgacus. Its best-known line is often translated:
“They make a desert and call it peace.”
Ancient historians routinely composed speeches that they thought appropriate to the occasion. Tacitus uses Calgacus to voice a powerful critique of Roman imperialism. That doesn’t mean Calgacus himself is necessarily fictional. But we cannot use the speech as a transcript of what a Caledonian leader actually said.
The speech tells us something fascinating about Roman attitudes towards their own empire. Tacitus was capable of recognising—or at least rhetorically exploring—the violence, enslavement and exploitation that accompanied Roman conquest.
Read: Agricola 29–32.
8. Agricola 33–35 — Agricola answers
Tacitus then gives Agricola his own speech. The literary structure becomes obvious: Tacitus allows the two commanders to present opposing interpretations of the coming battle.
Then the armies deploy. Tacitus says Agricola placed around 8,000 auxiliary infantry in the centre, with 3,000 cavalry on the wings, while keeping the legions behind as a reserve.
Tacitus’ account suggests that the decisive fighting at Mons Graupius was done primarily by auxiliary soldiers rather than legionaries. Many of those men weren’t Italians.
The Roman army fighting the Caledonians was itself an international force recruited across the Empire.
Read: Agricola 33–35.
9. Agricola 36–38 — The Battle of Mons Graupius
This is our only detailed literary account of the battle.
Tacitus describes Caledonian forces occupying higher ground, their chariots manoeuvring across the plain and Agricola sending auxiliary troops into close combat. The Caledonians were eventually routed.
In terms of military detail, Tacitus gives a vivid account of Roman auxiliary infantry bearing the brunt of the fighting, but his casualty figures (ten thousand Caledonians to just 360 Romans) must be treated as imperial propaganda rather than an objective body count.
We still don’t know where Mons Graupius was fought. No proposed battlefield has gained general archaeological acceptance. Agricola withdrew his army into winter quarters. The fleet was ordered to sail around Britain and returned after demonstrating that Britain was an island.
Read: Agricola 36–38.
Cassius Dio — Roman History
Writing: early 3rd century AD (surviving mainly via Byzantine epitomes)
Most important for: Covers the northern frontier crisis of the AD 180s and the campaigns of Emperor Septimius Severus (AD 208–211).
More than a century after Agricola, Scotland appears again in a major surviving historical narrative. Cassius Dio was a Roman senator and contemporary of Septimius Severus. Unfortunately, this section of Dio’s history does not survive intact. Much of what we have comes through the much later epitome made by the Byzantine writer John Xiphilinus.
That is important when judging exactly what Dio originally wrote.
Read Cassius Dio, Roman History Book 77
Dio 77.12 — The Caledonians and Maeatae
Dio identifies two principal northern peoples:
the Caledonians and the Maeatae.
He places the Maeatae close to the Roman frontier and the Caledonians beyond them. He then describes their supposed way of life, weapons and methods of warfare.The Maeatae are particularly interesting because they don’t appear in Tacitus’ first-century narrative.
Something had changed in the political geography of northern Britain. By the early third century, Rome appears to have regarded the Caledonians and Maeatae as the two dominant groupings beyond its frontier. Dio’s description contains classic ancient stereotypes about people living beyond the civilised world.
Claims about nakedness, communal women, primitive food and swamp-dwelling shouldn’t simply be read as anthropological observations. They help create an image of Rome’s enemies as fundamentally different from civilised Mediterranean society. Modern scholarship explicitly treats this passage in the context of Roman representations of supposedly wild northern peoples.
Read: Dio 77.12.
Dio 77.13 — Severus invades Caledonia
In AD 208, Emperor Septimius Severus came to Britain.
Dio says Severus wanted to subjugate the whole island and invaded Caledonia. The campaign sounds very different from Mons Graupius. There is no great set-piece battle. Instead, Dio describes Roman troops:
cutting forests • levelling ground • filling swamps • bridging rivers
while their opponents avoided battle and attacked isolated troops.
This is a war of movement, engineering, supply and attrition. Archaeologically, that makes Scotland’s network of Severan marching camps and reused military installations especially important.
Dio claims 50,000 Roman deaths. That number is extraordinary and should not be accepted literally without question, but it communicates Dio’s central point: campaigning in northern Scotland was enormously costly.
Dio also includes famous literary set-pieces, including Severus ordering his troops to kill all whom they met—even unborn children in the womb—and a sharp exchange between the Empress Julia Domna and the wife of the Caledonian chieftain Argentocoxos regarding marriage customs and sexual morality. As with Tacitus, these anecdotes serve to contrast supposed barbarian directness with Roman decadence.
Read: Dio 77.13.
Dio 77.15 — Revolt and renewed war
After agreements had apparently been reached, fighting resumed. Dio tells us that the Maeatae revolted and that the Caledonians joined them. Severus prepared another campaign.
Before he could conduct it personally, however, he died at York on 4 February AD 211. His successors abandoned the attempt to conquer northern Scotland. This was Rome’s last great imperial invasion of the north.
Read: Dio 77.15.
Herodian — History of the Empire
Writing: third century
Most important for: Severus • campaigning conditions • comparing accounts
Herodian gives us another account of the Severan invasion.
That is valuable because we can compare him with Dio.
Read Herodian 3.14 — The British War
Herodian 3.14 — Why Severus came to Britain
Herodian says the governor of Britain reported that peoples beyond Roman control were in revolt and requested either reinforcements or the emperor himself.
Severus decided to come.
Herodian adds another motivation: Severus wanted to remove his sons Caracalla and Geta from the luxurious life of Rome and expose them to military discipline.
The northern landscape
Herodian describes Severus preparing causeways so his army could move through marshy country.
That broadly echoes Dio’s emphasis on the extraordinary logistical difficulties encountered by the Roman army.
When two independent ancient accounts emphasise similar features, they deserve particular attention—although they may still ultimately depend upon related information.
Read: Herodian 3.14–15.
Ptolemy — Geography
Written: around AD 150
Context: Compiled in Alexandria using Roman naval records, itineraries, and reports from the Flavian and Antonine periods.
Key significance: Tribal names, coastal coordinates, native settlements, and fort locations.
Ptolemy’s Geography is the only surviving ancient source that provides a comprehensive gazetteer of northern Britain’s geography and indigenous peoples. Rather than narrative history, Ptolemy gives coordinate tables listing river mouths, headlands, tribal territories (such as the Votadini, Damnonii, and Caledones), and native settlements (poleis), including places like Trimontium (Newstead) and Alauna.
The most striking feature of his map is the famous eastward bend: north of Hadrian’s Wall, mainland Scotland is wrenched roughly ninety degrees to the east. This distortion likely arose because Ptolemy stitched together separate Roman military route itineraries and naval coastal surveys with differing baseline scales. Despite the cartographic warp, once the coordinates are rotated, his work provides an essential framework for identifying late Iron Age territorial boundaries and their relationship to Roman roads and forts.
Explore Ptolemy’s Geography, Book II
Ptolemy’s peoples of Scotland
His geography preserves names including:
Caledonii
Vacomagi
Taexali
Venicones
Damnonii
and several other groups.
Without Ptolemy, many of these names would simply be unknown.
Ammianus Marcellinus — Roman History
Writing: late fourth century
Most important for: Picts • Attacotti • Scots • AD 367 • Theodosius
Jump forward another century, and the names have changed again.
The Caledonians and Maeatae disappear from our surviving narratives.
Now we encounter the Picts.
Read Ammianus Marcellinus, Book 27
Ammianus 27.8 — Picts, Attacotti and Scots
Ammianus describes the serious crisis in Britain in AD 367.
He names:
Picts • Attacotti • Scots
and says the Picts were divided into two groups:
Dicalydones and Verturiones.
The Roman commander Theodosius was sent to restore order.
Compare those names with Dio.
Around AD 210:
Caledonians + Maeatae
By AD 367:
Dicalydones + Verturiones + Attacotti + Scots
Something substantial had happened to the political identities of northern Britain.
One particularly intriguing possibility is that Dicalydones preserves some memory of the earlier Caledonian name, although ancient ethnic names and later identities shouldn’t automatically be equated. This is one of the sources for investigating the transition from Roman-period Caledonia towards Pictland.
Read: Ammianus 27.8.
What about the Antonine Wall?
There is a striking gap in our ancient literary sources.
No surviving Roman historian gives us a proper account of the construction of the Antonine Wall.
That is why archaeology and inscriptions become so important.
We know considerably more about the Wall from:
distance slabs • building inscriptions • forts • fortlets • pottery • coins • roads • aerial archaeology • excavation
than we do from surviving Roman literature.
This is a useful reminder of how accidental our written evidence is.
The absence of a surviving account doesn’t mean an event was unimportant.
A timeline of the writers
| Approximate period described | Source | What it tells us |
|---|---|---|
| AD 77/78–84 | Tacitus | Agricola’s campaigns and Mons Graupius |
| 2nd century | Ptolemy | Peoples and places of northern Britain |
| AD 208–211 | Cassius Dio | Caledonians, Maeatae and Severus |
| AD 208–211 | Herodian | Another account of Severus’ invasion |
| AD 367 | Ammianus Marcellinus | Picts, Attacotti, Scots and Theodosius |
There is an important lesson in that table.
Our written evidence is not continuous.
There are enormous gaps.
For much of Roman Scotland’s history, archaeology has to tell the story.
Can we trust the ancient writers?
The answer isn’t simply yes or no. Instead, ask five questions whenever you read an ancient source:
- When was it written? Was the author contemporary with the events?
- How could the writer know this? Was he present, using earlier histories, official information, or simply repeating stories?
- Why was he writing? Biography, geography, history and imperial propaganda have different purposes.
- Is he using stereotypes? Descriptions of “barbarians” often tell us as much about Roman attitudes as about the people being described.
- Does archaeology support it? Camps, forts, coins, inscriptions and landscapes can sometimes test the written account.
Read Roman Scotland for yourself
Agricola’s invasion
Start with: chapters 10–11, 23, 25–27 and 29–38.
The Severan invasion
Cassius Dio — Roman History 77
Start with: 77.12–15.
Then compare Herodian’s account with Dio.
Roman geography
Look particularly at Book II.2, Albion.
Late Roman Scotland
Ammianus Marcellinus — Book 27
Look particularly at 27.8.
What the ancient writers don’t tell us
Perhaps the most important lesson is how much they leave out. Tacitus tells us about Agricola, but almost nothing about ordinary people living beside the Roman forts. Dio tells us about Severus, but not what life was like at Cramond.
No surviving historian explains why Marcus Cocceius Firmus dedicated his remarkable collection of altars at Auchendavy. No historian tells us about Nectovelius, the young Brigantian soldier who died at Mumrills.
And nobody describes the lives of the women whose names occasionally survive in the archaeological record.
For those stories we have to turn to another kind of primary source:
the inscriptions left by the people who were actually here.
→ Next: Explore Roman Inscriptions
