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Gelligaer Roman Site is a Roman fort situated in south Wales on bedrock formed from the Upper Coal Measures. The underlying geology of mudstone, siltstone and sandstone, interspersed with coal and ironstone deposits, reflects the industrial character of the landscape that would later define this region. The fort was strategically positioned to exploit and control these mineral resources, particularly the ironstone which the Romans valued for weaponry and tools. Its construction took advantage of the naturally defensible terrain created by the local topography.
The fort served as a military installation within the Roman network that secured Wales following the conquest under Agricola in the late first century. Gelligaer's placement in the South Wales valleys placed it at a crucial point for monitoring routes and managing the region's extractive industries. The site's importance lay not only in military control but in the direct access to raw materials essential for sustaining Roman military operations.
Today, Gelligaer Roman Site is protected by Cadw, the Welsh heritage organisation, under reference GM016. The monument remains a significant record of Roman military presence in Wales and demonstrates how strategic site selection reflected both defensive considerations and economic opportunities. The underlying Coal Measures geology serves as a tangible reminder of the natural resources that made this location valuable to the Roman occupation forces.
Gelligaer Roman Site is a scheduled monument protected by Cadw under reference GM016. View the official record →
Gelligaer Roman Site is a Roman fort situated in south Wales on bedrock formed from the Upper Coal Measures. It is designated a Scheduled Ancient Monument by Cadw under reference GM016.
Gelligaer Roman Site dates from the roman period, and is classified as a fort. It is one of over 32,000 scheduled monuments protected across the UK.
Gelligaer Roman Site 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 GM016.
Several scheduled monuments lie within 10 km, including Garnedd Lwyd (7.2 km), Cross Ridge Dyke & Earthwork on Cefn Eglwysilan (7.7 km), Twyn-Yr-Oerfel Round Barrows (8.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Gelligaer Roman Site'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.
Gelligaer Roman Site 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.