Brecon Y Gaer - Fort

With surprisingly well-preserved defences and a scenic location in the Bannau Brycheiniog (Brecon Beacons) National Park, the fort at Brecon Y Gaer ** is worth a visit. But getting there is a real challenge. Although looked after by Welsh national heritage body Cadw, there are no signs to the site, no vehicle access, and no interpretation once you get there.  No guidebook is available, and the information on Cadw's website is sparse. You are left with the clear impression that visitors are discouraged. Nevertheless, the fort can be reached with a bit of effort. 

Background and Context

The fort at Y Gaer occupies a strategically significant point in the Roman road network across what is now Mid and South Wales. Routes ran from here south-east to Caerleon (along the River Usk), south-west to Neath, west to Llandovery and north-east towards Clyro and beyond. The fort lies on raised ground next to the Afon Ysgir's junction with the River Usk - a naturally defensible site.

Y Gaer fort was initially built of timber and earthworks, probably around AD 75, when an auxiliary Spanish cavalry unit (ala) of the Vettones was garrisoned here; a tombstone of a twenty-year old cavalryman (Candidus) has been found nearby. Stone walls were added when the fort was rebuilt around AD 140. The name Cicucium has been associated with the site, although it is uncertain whether this was its Roman name. 

Evidence from three periods of excavation (most recently 2009-10) shows that the fort didn't only function during the Roman conquest of the area, but continued to play a role through the Severan era (broadly AD 193-235) right up to the late 3rd and 4th century. Although not now visible, remains of a civilian settlement (vicus) lay outside the fort's north gate, including a possible bath-house and courtyard structures - one of which might have been a mansio (guest house or inn). Y Gaer was clearly an important staging point on routes into West Wales. The discovery of Native as well as Roman metalwork at Y Gaer poses interesting questions about the interaction between soldiers and local people here.

Brecon Y Gaer fort - west gate

Location and Access

Y Gaer fort lies 4 km west of Brecon, Powys, Wales (Google Maps location here). The nearest public road runs from Cradoc (Cradoc Road heads west from the centre of Brecon) to Aberbran (reached by a bridge over the River Usk from the A40 around 6 km west of Brecon). A private road links the Cradoc-Aberbran road to the farm containing the Roman fort. However, its use to access the site is explicitly discouraged (see sign below); interestingly, this was the only signage that I could find relating to the site, and even this doesn't explain what "the monument" actually is.

Unhelpful sign at the start of the private road

It is unclear whether there would be any objection to people walking or cycling up this road, and indeed Cadw suggests accessing the site by bike. In any event, there is no safe roadside parking in the vicinity of this junction, as the roads are single track with high hedge banks, so you can't just park and walk from this point.

But all is not lost. With reference to the Ordnance Survey map (Explorer OL12 Brecon Beacons West) two public rights of way pass close to the fort. One of these is a bridleway, running around 4 km from near the outskirts of Brecon. It may be possible to cycle along this route, but I didn't try it. 

More usefully, a public footpath runs from the Cradoc-Aberbran road up to Y Gaer, a distance of around 500 metres. This is a pleasant walk in summer, albeit involving a steep slope by the river and the need to negotiate two fields that may contain cattle. In wet weather, the route could get boggy, and wellies would be an advantage. The start of the footpath is shown below (Google Maps location here).

Start of the footpath to Y Gaer

While there is nowhere safe to park near the beginning of this footpath, a large lay-by (Google Maps location here) lies a short distance west (around 100 metres). There is space for several vehicles to park; however, it is necessary to walk along a short section of narrow road (below) to reach the beginning of the path, so do take care.

Road to lay-by (just visible in the distance) - take care!

Both the footpath and bridleway lead to a point on the private road next to a large detached house (Y Gaer) (Google Maps location here). From here, you need to follow the road south (between walls containing some suspiciously Roman-looking stones) and through a gate into the farmyard (pictured below). Note that there are no signs to guide you.

Go through the gate into the farmyard, turn left after the barn ...

Once through the gate, walk past the barn on your left and then turn left, going through a gate that's quite tricky to open. From here you can see the north wall of the fort, from which you are separated by three more farm gates. (At this point on my visit, a farmer appeared on a quad bike and waved me through, so I knew that I was on the right track). Go through these and you have reached the field containing the fort. Well done!

 

... and through these three gates. Part of the north fort wall is visible on the left.

Date of my Visit

The photos in this blog post were taken on my visit in 2026. 

Exploring the Roman Fort

None of the fort's internal buildings and structures are visible, but it is possible to walk around the inside of the defensive perimeter. Three gates, one angle tower and stretches of wall are visible; the farm buildings lie on the site of the north gate. A clockwise direction is suggested, so turn left after entering the field. On your left is the line of the fort's north wall (below).

Brecon Y Gaer fort - north wall (unconsolidated section)

This section of wall is better viewed from the other (north) side, which can be reached by crossing a stile at the corner of the fort. Here the wall stands over three metres in height, with the outer ditch also visible (below).

Brecon Y Gaer fort - north wall and ditch

The stile also gives access to the foundations of a square tower set in the rounded corner of the fort wall. This is the best preserved of the fort's (assumed) four angle towers.

Brecon Y Gaer fort - north-eastern angle tower

Brecon Y Gaer fort - fort wall at north-east angle tower

Continuing in a clockwise direction, the fort's east wall appears as a line of rubble crowned by trees:

Brecon Y Gaer fort - line of east wall

A break in the trees, and another stile, allows you to inspect the remains of the east gate (below) - rather overgrown at the time of my visit. Only one of the two guard chambers (the northern one) is visible here.

Brecon Y Gaer fort - east gate

A view  back across the interior of the fort from near this point (see photo below) shows that no structures can be seen. However, excavation by the Wheelers in the early 1920s revealed evidence of the headquarters building (principia), a granary and a possible bath-house (unusual within the fort itself, although a later one appears to have been built outside the walls).

    

Brecon Y Gaer fort - interior (no structures visible)

Our route around the fort's defences now brings us to the south wall, which although not consolidated is at least devoid of trees - so can be inspected more closely.

Brecon Y Gaer fort - south wall

The south gate, facing the River Usk, is well-preserved, with both guard chambers visible, and two carriageways separated by a central pier, which has a doorway through it. The line of a drain is visible in the eastern carriageway.

Brecon Y Gaer fort - south gate

Brecon Y Gaer fort - south gate (western guard chamber and central pier)

Brecon Y Gaer fort - south gate (eastern guard chamber)

Continuing around the circuit brings us to the west gate, also well-preserved. This has a similar twin carriageway layout to the south gate, but is unusual in that the guard chambers project out from the main wall of the fort. This may have reflected its 'main gate' status, as the internal road would have led straight to the principia.

Brecon Y Gaer fort - west gate (south guard chamber)

Brecon Y Gaer fort - west gate (north guard chamber)

This completes our tour of the fort. The north gate would have been located under where the modern complex of farm buildings now stand. 

Final Thoughts

If you have made it this far, congratulations! To some extent, I have made light of this site's access arrangements. But there is a serious point here. As it stands, the fort has no interpretation and cannot easily be visited by people with mobility difficulties. This could be very different if proper parking, signage and footpath routes were put in place. Obviously the site lies on a working farm - sheep were very much in evidence during my visit - but many historic sites occupy agricultural land, and suitable access arrangements can usually be made. I don't know what has happened here, but the present set-up is surely unsatisfactory for one of Wales' most significant Roman sites. Over to you Cadw!

Site References

Burnham, Barry and Davies, Jeffrey (2021). 'Forts, Vici and related extramural activity in Wales and the marches: recent discoveries at the Roman fort of Pen y Gaer (Powys) and their wider implications.' Britannia, 52, pp.67-95.

Lewis, Joe (2016). 'Finds from the frontier: Romans and natives at Brecon Gaer Roman fort.' Journal of Roman Military Equipment Studies, 17 pp. 235-242.

(See also the general References page of this blog).

Text and photographs (c) Mike Hetherington. Visits to Roman sites described in this blog are at your own risk.