Hadrian's Wall is one of the most visited historical sites in Britain, receiving approximately a million and a half visitors a year. Most of those visitors arrive with a set of assumptions about the Wall that are, at varying degrees, inaccurate.
These are not trivial inaccuracies. They go to the heart of what the Wall was for, who built it, and what it tells you about the Roman Empire's relationship with the territory it controlled. Getting them right changes the Wall from a line on a map into one of the most interesting military and political structures in European history.
Myth 1: It Was Built to Keep Out the Scots
The Scots did not exist as a political or ethnic category when Hadrian's Wall was built in the 120s AD. The Irish tribal groups who would eventually become the Scots of Scottish history had not yet arrived in significant numbers in the territory that would become Scotland. The people living north of the Wall's construction line were primarily Caledonian tribes, ancestors of the Picts, with their own distinct culture and political organisation.
"Keeping out the Scots" is an anachronism that reads later ethnic categories back into a period where they did not exist. It is also geographically imprecise: the Wall ran across the Tyne-Solway gap, roughly following the geography of the modern northern England, not the modern Scottish-English border, which lies further north.
The Wall's relationship to the people north of it is more complex than simple exclusion. The barbarians beyond Hadrian's Wall post examines what the Caledonians and their successors actually were, which is considerably more interesting than the "ancient Scots" simplification.
Myth 2: Hadrian's Wall Was the Northernmost Frontier of the Roman Empire
This is demonstrably false. The Antonine Wall, built approximately twenty years after Hadrian's Wall across the Forth-Clyde line in what is now central Scotland, was further north. It was the frontier of the Roman Empire during its operational period in the 140s to approximately 160s AD.
The Antonine Wall was abandoned, and Hadrian's Wall was reoccupied as the frontier. But for at least two decades of the second century AD, the Roman Empire extended further into Scotland than Hadrian's Wall, and there was an active Roman military presence north of the Wall throughout the second and third centuries.
The claim that Hadrian's Wall was always the effective northern limit of Roman Britain is a simplification that the Antonine Wall's existence refutes directly. The frontier moved. Roman Britain was not a static entity with fixed borders; it expanded and contracted in response to military and political conditions.
Myth 3: The Wall Was Built by Slaves
The Roman army built Hadrian's Wall. This is documented in the building inscriptions, the "centurial stones," that were placed at regular intervals by the legionary centuries (units of about eighty men) who built each section. These stones record the unit, and sometimes the name of the centurion, responsible for a specific section.
The three legions that built the Wall were the Second Augusta, the Sixth Victrix, and the Twentieth Valeria Victrix, all of which were stationed in Britain during Hadrian's reign. These were professional soldiers, Roman citizens or men who would become citizens on completing their service. They were not slaves.
Enslaved people may have been involved in ancillary work: quarrying stone, transporting materials, providing labour for camp construction. But the primary workforce of Wall construction was the Roman military, and its involvement is directly attested by the physical evidence.
Myth 4: The Wall Was Built to a Single Design Completed All at Once
The Wall's construction history is considerably more complex than this. It was planned as a stone wall with a turf rampart at its western end (west of the River Irthing), then revised to stone throughout. The originally planned width of ten Roman feet was reduced to six or eight feet during construction, apparently for logistical reasons.
The vallum, the earthwork ditch-and-mound system on the Wall's southern side, was added during construction and appears to have been designed to control access to the Wall from the south, creating a military zone that civilians could not enter without going through controlled crossing points.
The milecastles (gateways at each Roman mile) and turrets (watchtowers at each third of a mile between milecastles) were part of the original plan, but the forts (the main garrison stations housing cohorts of soldiers) were not initially part of the design. Forts were added to the Wall itself partway through construction, replacing the plan to garrison the Wall from forts south of the vallum.
This kind of mid-construction design revision is exactly what you would expect from a large-scale project being built by different legionary units over several years. It means that the Wall you see today is a composite of decisions made at different stages of construction, not a single unified design executed as planned.
Myth 5: The Wall Was Built Because of Scottish Aggression
The Historia Augusta, the primary literary source for Hadrian's decision to build the Wall, says only that Hadrian visited Britain and built a wall to separate the Romans from the barbarians. It does not specify what prompted the decision.
The most likely context is a combination of factors: the aftermath of the reign of Trajan, who had attempted to expand the Empire to its maximum extent, and the policy reversal under Hadrian, who decided that defined and defensible frontiers were preferable to continuous expansion. The Wall is better understood as a statement of imperial policy, the decision to define and hold a specific frontier, than as a response to a specific military threat.
The Roman soldiers letters home post provides the perspective of the people who actually garrisoned the Wall, which is considerably more mundane than the frontier defence narrative suggests: requests for beer, socks, and news from home.
What the Wall Was For
The Wall's actual functions, as best the archaeological and historical evidence allows us to reconstruct them, included:
Control of movement: the Wall's milecastles had gates allowing movement north and south. The Wall was not an impenetrable barrier but a controlled crossing point, through which trade, diplomatic contact, and military operations passed in both directions.
The English Heritage Hadrian's Wall resources at English Heritage document the Wall's construction and function in detail. The Wikipedia article on Hadrian's Wall is a thorough overview of the current state of scholarly knowledge.
Intelligence and communication: the watchtowers at each third of a mile provided visual coverage of both the northern approaches and the controlled zone between the Wall and the vallum. The signalling system, using fire and possibly other visual signals, could convey information along the Wall quickly.
Revenue: the gate system at the milecastles allowed the Roman authorities to levy customs duties on goods crossing the frontier. The Wall was, among other things, a customs barrier.
Symbolic: the Wall was also a statement of Roman power and organisation, visible on the landscape and requiring maintenance that demonstrated continuous Roman administrative presence.
The LocationsLive Northumberland experience
Walking the Wall today, with the archaeological and historical reality rather than the simplified myth in mind, is a fundamentally different experience. The milecastles make sense as controlled crossing points rather than defensive fortifications alone. The relationship between the Wall, the vallum to the south, and the road behind it becomes a legible integrated system.
The Vindolanda site, where the tablets were found and where excavation continues, is the complement to the Wall itself: the human geography of the garrison community that the Wall's military infrastructure was designed to support. Understanding both is understanding what the Roman frontier actually was.
The Bottom Line
Hadrian's Wall was built by Roman soldiers, not slaves. It was not the northernmost Roman frontier. It was not built specifically to keep out the Scots. Its design was revised during construction in response to practical conditions. And it served multiple functions simultaneously, not just the dramatic one of military defence.
These corrections do not make the Wall less interesting. They make it more interesting. A structure that was simultaneously a customs barrier, a communication system, a symbolic statement of imperial power, and a garrison for thousands of soldiers drawn from across the empire, who lived alongside their families in a community that was genuinely multicultural by the standards of its time: this is a more complex and more fascinating history than the simplified myth provides.
The myth says "the Romans built a wall to keep out the Scots." The reality says the Romans built a complex frontier infrastructure system to manage the northern boundary of a diverse, multi-ethnic empire, using professional soldiers from Belgium and Syria and North Africa, who then spent their careers asking for beer and socks and birthday party invitations.
The reality is better.
