Why Hadrian Built His Wall
When Emperor Hadrian visited Britain in AD 122, the northern frontier was a problem. Roman forces had been pushing into Scotland and pulling back for decades, and the boundary between Roman civilisation and the unconquered north was vague, expensive to defend, and increasingly dangerous.
Hadrian's solution was radical: build a wall. Not a simple barrier, but a 73-mile military zone stretching from coast to coast across the narrowest point of northern England — from Wallsend on the Tyne to Bowness-on-Solway.
More than a border
The popular image of Hadrian's Wall as a simple defensive barrier — keeping barbarians out — is misleading. The Wall was far more sophisticated than that.
It was a customs and immigration checkpoint, controlling the movement of people, goods, and livestock across the frontier. It was a statement of imperial power, visible for miles in every direction, reminding everyone — Roman and non-Roman alike — who was in charge. And it was a military platform, giving the garrison elevated positions from which to observe, patrol, and respond to threats.
The scale of ambition
The numbers are staggering. The Wall was built by three legions — around 15,000 soldiers — and took approximately six years to complete. It was originally planned at 10 Roman feet wide and 15 feet high, with a milecastle every Roman mile and two turrets between each pair.
Sixteen major forts were added along its length, housing auxiliary troops from across the Empire — Gauls, Batavians, Spaniards, and Syrians. At its peak, around 9,000 soldiers were stationed on or near the Wall.
Walking it today
The most dramatic sections of the Wall follow the volcanic ridge of the Whin Sill, where the landscape itself becomes a natural fortification. Standing on the Wall here, looking north across empty moorland, you feel the full weight of Rome's ambition — and the wildness of the land beyond.
On the Danelaw Tours route, we walk along the most scenic sections of the Wall with expert commentary on Roman frontier life. It's one of the most memorable stops on the journey.