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Pen y Gyrn Roman Road is a Roman road in Wales, protected by Cadw under reference ME264. The route crosses terrain underlain by Caradoc Rocks, a succession of mudstone, siltstone and sandstone deposits laid down during the Caradocian period of the Ordovician. This solid geology would have provided a reasonably stable foundation for road construction, though the softer mudstone and siltstone elements of the bedrock sequence required careful engineering to manage drainage and prevent subsidence.
The road follows the landscape of central Wales, where Roman military planners connected strategic positions during the first and second centuries AD. The Caradocian bedrock, whilst relatively modest in height, offered higher ground suitable for sighting and communication between garrisons. The road's course reflects Roman surveying practice, taking advantage of natural ridges and firmer ground where the sandstone beds outcropped more prominently.
Today, the line of Pen y Gyrn Roman Road remains visible as an earthwork feature in the Welsh landscape, its preservation dependent on the underlying geology and the absence of later intensive agricultural use. The road's survival demonstrates how Roman civil engineering adapted to local stone and soil conditions, creating a durable route that has withstood nineteen centuries of weather, drainage, and plant growth across difficult upland terrain.
Pen y Gyrn Roman Road is a scheduled monument protected by Cadw under reference ME264. View the official record →
Pen y Gyrn Roman Road is a Roman road in Wales, protected by Cadw under reference ME264.
Pen y Gyrn Roman Road dates from the roman period, and is classified as a road. It is one of over 32,000 scheduled monuments protected across the UK.
Pen y Gyrn Roman Road 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 ME264.
Several scheduled monuments lie within 10 km, including Caer Gai Roman Site (2.9 km), Foel y Geifr Cairn (4.5 km), Castell Carn Dochan (5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Pen y Gyrn Roman Road'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.
Pen y Gyrn Roman Road stands on Caradoc Rocks (Undifferentiated), bedrock that formed in the Caradocian. The rock here is mudstone, siltstone and sandstone.