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Hirfynydd Roman Earthwork is a Roman signal station situated in Wales, built upon South Wales Upper Coal Measures bedrock. The underlying geology, formed during the Westphalian period, comprises mudstone, siltstone, sandstone, coal and ironstone deposits characteristic of the South Wales coalfield. The ferricrete weathering products of these rocks would have been locally available for construction and surfacing.
Signal stations of this type formed part of the Roman military communications network, typically occupying elevated positions to relay messages across distances using fire or smoke signals. Such installations were usually modest, with earthen ramparts and ditches defining a compact enclosed space adequate for a small garrison and signalling apparatus. Their strategic value depended upon inter-visibility with neighbouring stations rather than defensive capacity.
The site is protected as a scheduled monument by Cadw, the Welsh heritage protection authority, under reference GM274. Its survival as an upstanding earthwork preserves evidence of Roman frontier strategy and the surveying expertise required to position stations across varied Welsh terrain. The monument contributes to understanding Roman communications infrastructure in the province, complementing excavated examples elsewhere along the frontier.
Hirfynydd Roman Earthwork is a scheduled monument protected by Cadw under reference GM274. View the official record →
Hirfynydd Roman Earthwork is a Roman signal station situated in Wales, built upon South Wales Upper Coal Measures bedrock. It is designated a Scheduled Ancient Monument by Cadw under reference GM274.
Hirfynydd Roman Earthwork dates from the roman period, and is classified as a signal station. It is one of over 32,000 scheduled monuments protected across the UK.
Hirfynydd Roman Earthwork 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 GM274.
Several scheduled monuments lie within 10 km, including Roman Marching Camp South West of Melin Court Brook (6.7 km), Camp 280m S of Melin Court Brook (6.7 km), Pen-Rhiw-Angharad Round Cairns (8.1 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Hirfynydd Roman Earthwork'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.
Hirfynydd Roman Earthwork 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.