Travels With My Aunt

Random notes on the travels of a Welshman who has been allowed out to play after finishing his chores. OK so I don't travel with my Aunt, but I am usually under the adult supervision of my long suffering wife.

Y Gaer: The Roman Cavalry Fort Hiding in a Breconshire Farmyard

The other day we took delivery of our new motorhome and decided to stay at a quiet campsite not far from home to spend two day checking everything over in a shakedown. Just incase you are interested everything worked perfectly – which was very pleasing! During the evening I was looking at some maps and noticed that just a short walk away was Y Gaer, a Roman Fort that has been on my list for a few years. So I persuaded Aunty that once we had finished putting things in cupboards, then moving them to other cupboards it would be a great idea to walk across the fields to explore and see exactly what is left after almost 2000 years.

The small country road we followed on the last part of the walk was very quiet adding to the sense of adventure as we turned into a farm lane. Quickly we entered into a working farmyard. As there are no signs we knocked on the farmhouse door for directions, making sure we were not going to be trespassing. The farmer was very friendly and gave us simple directions. After a short orienteering course walking through the farm yard, up a small ramp into the sheep pens we spied our objective. There, through a field gate on the left, a wall of dressed Roman masonry rises out of the grass to well over head height. There is no ticket office, no interpretation panel, no brown tourist sign on the main road. Just sheep, the sound of the Afon Ysgir and the Usk meeting somewhere below the hedge-line, and nearly two thousand years of frontier history standing quietly in a farm field, now guarded by a flock of recently shorn sheep.

The significant remains of the east wall.
The significant remains of the east wall.

This is Y Gaer — Welsh simply for “the fort” — one of the largest auxiliary forts the Roman army built in Wales (Roman-Britain.co.uk, n.d.). It has none of the drama of a clifftop castle. What it offers instead is something rarer: a genuinely unaltered Roman frontier post, in the landscape that made it strategically necessary in the first place, still watched over by the same hills that watched the Silures resist Rome for thirty years.

Unlike later fort and castles scattered throughout Wales and beyond, Y Gaer was not raised for a lord or a bishop but for the Roman state, as part of the military infrastructure that followed Rome’s conquest of south-east Wales. The people of this region, the Silures, had resisted Roman expansion since around AD 48, and Tacitus records that it was the governor Sextus Julius Frontinus, in post from roughly AD 74 to 78, who finally reduced them “by force of arms,” overcoming “not only the valour of the enemy but also the physical difficulties of their land” (Tacitus, Agricola, ch. 17). Y Gaer’s founding date of around AD 75 sits squarely inside that campaign window, which strongly suggests it was built as part of Frontinus’s programme of forts consolidating Roman control rather than as a later, purely administrative addition.

The remains of the East Gate
The remains of the East Gate

The garrison that built and first occupied it was the Ala Hispanorum Vettonum civium Romanorum — up to 500 cavalrymen recruited from the Vettones, a people of what is now western-central Spain, granted the honorific status of Roman citizens as a unit (Wikishire, n.d.; Cadw, n.d.). As was standard Roman practice, the soldiers themselves would have dug the ditches and raised the ramparts of their own fort — there was no separate corps of civilian builders. Its purpose was threefold: to hold a strategic river and road junction, to police a recently subdued population, and to project Roman authority visibly into land that, a generation earlier, had been entirely outside imperial control.

The first fort, built around AD 75, was a typical early Roman turf-and-timber structure: ramparts of clay resting on a cobbled base, topped with a wooden palisade, enclosing timber buildings — one of which is thought to have been a stable block, fitting for a cavalry garrison (Cadw, n.d.; CPAT, n.d.). Nothing about this phase was intended to be permanent; timber forts of this kind were quick to build and, crucially, quick to remodel as circumstances changed.

That change came in the second half of the 2nd century AD, when Y Gaer was rebuilt in stone by men of Legio II Augusta, the legion based some forty miles away at Isca (Caerleon) (Cadw, n.d.; CPAT, n.d.; VisitWales, n.d.). This was part of a wider pattern across Roman Britain, where timber “conquest-period” forts were converted to stone once occupation had settled into something closer to routine garrison duty. The result — a rectangular enclosure of about 204 by 154 metres, some 3.14 hectares, with an entrance in the centre of each side and rounded corner towers — still stands in places to around 2.4 metres, with sections of the north wall reaching closer to 3 metres (Roman-Britain.co.uk, n.d.; Cadw, n.d.). A ditch up to 9 metres wide protected the walls beyond, and the surviving gateways still show the sockets where the great wooden gates once pivoted.

Looking towards the north and east wall shows the real size of the fort, not easy to catch on camera though.
Looking towards the north and east wall shows the real size of the fort, not easy to catch on camera though.

Y Gaer’s building history is really the story of a garrison being progressively scaled down as the frontier moved elsewhere. During the campaigns associated with Septimius Severus in the early 3rd century, the interior was substantially remodelled: a new well was sunk beside the granaries and a bathhouse built inside the defences, changes that most likely reflect a reduced garrison rather than an expanding one (Roman-Britain.co.uk, n.d.). There is some — though not conclusive — evidence for a smaller force reoccupying the site later in the 3rd century, and further repairs to the rampart wall are recorded around AD 367, with the latest coin recovered from the site belonging to the reign of Gratian (AD 367–383) (Roman-Britain.co.uk, n.d.). Whether this represents an unbroken garrison through to the late 4th century, or a series of separate, smaller reoccupations, is genuinely uncertain: even the Princeton Encyclopaedia of Classical Sites is cautious, noting only that regular military occupation is not certain to have continued much beyond the 2nd century, even though the stone gates were clearly rebuilt at least once afterwards (Stillwell et al., 1976).

The East Gate

Here is the honest, and rather instructive, answer: no siege, battle or named engagement is recorded at Y Gaer itself, either archaeologically or in any surviving text. That absence is not a gap in the record so much as the point of the place. Y Gaer’s military role was deterrence and control, not combat — a cavalry garrison positioned exactly where two Roman roads and two rivers converged, able to move troops quickly along the Usk valley toward Gobannium (Abergavenny) and Isca (Caerleon), or north-west toward the marching camps at Y Pigwn (Wikipedia, 2026; Roman-Britain.co.uk, n.d.).

The large South Gate
The large South Gate

The wider political background explains why that mattered. The Silures had fought a prolonged guerrilla campaign against Rome from around AD 48, sheltering the exiled British leader Caratacus and, according to Tacitus, wearing down successive governors before Frontinus’s decisive campaigns of AD 74–78 (Tacitus, Agricola, ch. 17; Britannica, n.d.). A fort garrisoned by 500 Spanish cavalry at a river crossing in the newly conquered heartland was not there to fight a battle — it was there to make sure one never needed to happen again. The later, less certain phase of repair work around AD 367 falls within the period of Britain-wide unrest sometimes called the “barbarian conspiracy,” but no specific attack on Y Gaer is attested, and the connection between the two remains circumstantial rather than proven.

Beyond the walls, ordinary life at Y Gaer looked much like life at any Roman frontier post. A civilian settlement, or vicus, stretched roughly 300 metres along the road from the north gate — mostly timber buildings, though excavation identified at least one stone workshop, and a separate stone building to the west of the fort that may have served as a mansio, a way-station for official travellers (Stillwell et al., 1976). Inside the defences stood the principia (headquarters building), which housed a small shrine for the unit’s standards and an underground strongroom for the pay chest, with the praetorium — the commanding officer’s house — nearby (Britain Express, n.d.).

The people who lived and died here are not anonymous. A tombstone found about a mile north of the fort, now held at the Y Gaer cultural hub in Brecon, commemorates Candidus, a young trooper of the Vettonian cavalry, of the troop of Clemens, who died aged twenty after just three years’ service (RIB 403; Cadw, n.d.). A rare, precisely dated glimpse of one individual life inside a garrison that history otherwise remembers only in earthworks and postholes.

Another tombstone, once built into the wall of Brecon Priory and since lost, recorded Valerius Primus, a trooper who had risen to optio — an under-officer and a centurion’s second-in-command — before his heir set up the stone in his memory (RIB 405). A third memorial, showing a couple carved life-size, points to families and dependants attached to the garrison, though far less is documented about this stone than about the two military tombstones. Together they are a reminder that the fort’s economy — its demand for food, fodder, leather and pottery — would have quietly reshaped the surrounding countryside for three centuries.

Like so many Roman sites in the UK there is no single dramatic fall recorded for Y Gaer. Occupation seems to have thinned rather than ended abruptly, and once official military use ceased, the stone did what abandoned Roman masonry across Britain generally did: it became a quarry for later builders. One tradition, reported in several secondary sources though not proven by any documentary record, holds that stone from Y Gaer was carried into Brecon to help build the new Norman castle after Bernard de Neufmarché’s conquest of the kingdom of Brycheiniog around 1093 (Wikipedia, 2026).

The fort’s modern history really begins in 1924–25, when it was excavated by Mortimer Wheeler and his wife, Tessa Wheeler, who was a remarkable woman and deserves more recognition. The Wheelers were responsible for a run of influential Welsh Roman-site excavations that also took in Segontium and Caerleon (Trowelblazers, 2022). Tessa organised the dig, controlled its finances and recorded the finds; Mortimer directed the work and interpreted the results — a division of labour common at the time but only recently given its due credit. Their findings were published the following year as The Roman Fort near Brecon (Wheeler, 1926), still the foundational excavation report on the site and a great read (I’ve included a link so you can download the report).

Today Y Gaer is a Scheduled Monument in the care of Cadw, Welsh Government’s historic environment service, though the surrounding land remains a working farm and part of the northern defences lies beneath farm buildings (Cadw, n.d.). I suspect the very smart stone built barn has used stones from the wall and is sited on the site of the north gate. Fittingly for a place built for cavalry rather than crowds, there is no vehicular access, no car park, and no signposting from the road (Cadw, n.d.). So park considerately and try not to block access for the farmer, otherwise you will not be popular. One visitor account describes a 1950s repair campaign that used ordinary cement mortar, inadvertently trapping moisture and accelerating decay of the original Roman stonework; more recent conservation work by Cadw favours breathable, lime-based repointing instead (Britain Express, n.d.). There are still no on-site interpretation panels, so a little homework — or this article — goes a long way before you visit. And please be respectful – this a working farm and someones livelihood.

Further Reading

Paul Challinor

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