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Twyn y Bridallt Roman Camp is a Roman marching camp situated on the Coal Measures bedrock of South Wales. The site occupies terrain formed from Westphalian deposits of mudstone, siltstone and sandstone, overlaid with coal seams and ferricrete that would have presented a firm foundation for temporary military structures. The camp's location reflects Roman strategic positioning in the region during their campaigns across Wales.
Marching camps of this type were constructed rapidly by the Roman army during military operations, serving as fortified overnight stops for troops on the move. The camp's layout would have followed standard Roman military engineering practice, with ditches and ramparts arranged in a characteristic rectangular plan. The site's position within the Coal Measures landscape suggests it formed part of a wider Roman network of temporary and permanent installations across South Wales.
The monument is protected by Cadw, the Welsh Historic Monuments organisation, under the reference GM259, ensuring its preservation for archaeological study and as a record of Roman military activity in Wales. The camp represents the physical evidence of Rome's military presence and the logistical infrastructure required to sustain campaigns in the principality during the Roman occupation of Britain.
Twyn y Bridallt Roman Camp is a scheduled monument protected by Cadw under reference GM259. View the official record →
Twyn y Bridallt Roman Camp is a Roman marching camp situated on the Coal Measures bedrock of South Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM259.
Twyn y Bridallt Roman Camp dates from the roman period, and is classified as a marching camp. It is one of over 32,000 scheduled monuments protected across the UK.
Twyn y Bridallt Roman Camp 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 GM259.
Several scheduled monuments lie within 10 km, including Carn-y-Pigwn Round Cairn (1.3 km), Mynydd Ty'n-tyle cairns (2.1 km), Tarren Maerdy cairn (E) (2.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Twyn y Bridallt Roman Camp'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.
Twyn y Bridallt Roman Camp stands on South Wales Upper Coal Measures Formation, bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.