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Carmarthen Roman Fort is a Roman military installation in Wales, protected as a scheduled monument by Cadw. The fort sits upon bedrock formed from Arenig mudstone, siltstone and sandstone, deposits laid down during the Arenigian geological period. This foundation of hard, stratified rock provided a stable base for the construction and occupation of the fort during the Roman period.
The fort represents part of Rome's military infrastructure established to control and defend the province of Wales. Its position reflects strategic Roman planning, with the underlying geology contributing to the site's suitability for permanent garrison settlement. The Arenig rocks, exposed naturally across the Welsh landscape, would have provided building material alongside imported Roman construction methods and materials.
Today, the fort remains an important archaeological site documenting Roman occupation and administration in Wales. The monument's location on the upland terrain shaped by ancient mudstone and sandstone bedrock connects the Roman military presence directly to the natural landscape that both constrained and supported their operations. As a protected monument, the site contributes to understanding Roman military organisation and settlement patterns across the Welsh frontier.
Carmarthen Roman Fort (part of) is a scheduled monument protected by Cadw under reference CM235. View the official record →
Carmarthen Roman Fort is a Roman military installation in Wales, protected as a scheduled monument by Cadw. It is designated a Scheduled Ancient Monument by Cadw under reference CM235.
Carmarthen Roman Fort (part of) dates from the roman period, and is classified as a fort. It is one of over 32,000 scheduled monuments protected across the UK.
Carmarthen Roman Fort (part of) is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is CM235.
Several scheduled monuments lie within 10 km, including Standing Stone NNW of Clomendy (5.9 km), Meini Llwydion Burial Chamber (6 km), Banc y Bettws Castle Mound (6.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Carmarthen Roman Fort (part of)'s history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Carmarthen Roman Fort (part of) stands on Arenig Rocks (Undifferentiated), bedrock that formed in the Arenigian. The rock here is mudstone, siltstone and sandstone.