Pen-y-Gaer is a small Roman auxiliary fort in the upper Usk valley, Powys, sited on a low ridge overlooking the river near the modern hamlet of Cwmdu. It was established as part of the Flavian conquest and consolidation of Wales, probably in the 70s AD under Frontinus, and formed an intermediate garrison post on the road running roughly 25 Roman miles between Brecon Gaer (Cicucium) and Gobannium (Abergavenny). The fort is modest in scale (around 1.5–1.7 hectares), consistent with a single auxiliary cohort, though the duration of occupation is unclear and it may have been held only into the earlier 2nd century.
Source: Pleiades — A Community-Built Gazetteer and Graph of Ancient Places. View the Pleiades record →
Its role was essentially logistical and tactical — to break the long march between the two larger Usk-valley forts and to police the surrounding Silurian territory during and after the conquest period. It is one of a tight network of small forts and fortlets imposed on south-east Wales to lock down the region, rather than a site of administrative or civilian importance.
The playing-card outline of the fort, with traces of rampart and ditches, is still discernible as earthworks, and antiquarian and later observations have noted the defences and Roman material from the surface, but no major modern excavation has been published. As a result, details of internal buildings, garrison identity, and precise occupation dates remain essentially unknown for this particular site.
Pen-y-Gaer is a small Roman auxiliary fort in the upper Usk valley, Powys, sited on a low ridge overlooking the river near the modern hamlet of Cwmdu. It is recorded in the Pleiades gazetteer of ancient places as a fort site from the Roman period in Britain.
Pen-y-Gaer Roman fort is classified as a Roman fort — a military site in the Pleiades ancient world gazetteer. Roman Britain's archaeology encompasses thousands of sites ranging from legionary fortresses and marching camps to villas, temples and towns.
Several Roman sites lie within a short distance, including Cefn-Brynich (10.9 km), ‘Gobannio’ (15 km), Three Cocks Roman fort (15.3 km). Aubrey Research maps over 2,200 Roman sites across Britain, drawn from the Pleiades ancient world gazetteer.
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