© Mapbox · © OpenStreetMap contributors · Boundary data © Cadw
Pen y Gaer Hillfort is a prehistoric hillfort located in Wales, protected as a scheduled monument under Cadw reference DE231. The site sits upon bedrock of the Millstone Grit Group, a geological formation dating to the Namurian period, composed of mudstone, siltstone and sandstone layers that have shaped the underlying landscape and available building materials throughout the monument's history.
Like many British hillforts, Pen y Gaer was constructed to exploit the defensive advantages of elevated terrain, with its ramparts and ditches positioned to command views across the surrounding countryside. The solid substrate of Millstone Grit would have provided a stable foundation for the construction and maintenance of these earthwork defences, whilst also determining the character of the topography itself.
The monument represents a significant phase in Welsh prehistoric settlement and land use, when hillforts served as focal points for communities during the later Iron Age and earlier periods. As a scheduled monument in Cadw's care, Pen y Gaer remains an important archaeological resource for understanding the settlement patterns, defensive strategies and territorial organisation of prehistoric Wales.
Pen y Gaer Hillfort is a scheduled monument protected by Cadw under reference DE231. View the official record →
Pen y Gaer Hillfort is a prehistoric hillfort located in Wales, protected as a scheduled monument under Cadw reference DE231.
Pen y Gaer Hillfort dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across the UK.
Pen y Gaer Hillfort 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 DE231.
Several scheduled monuments lie within 10 km, including Motte castle adjacent to Oaklands Hall, Chirk Bank (6.9 km), Offa's Dyke: section two miles 780yds (3930m) long, from the stream W of Brook Cottage, Selattyn, to footpath crossing dyke W of Bron-y-Garth Also in Clwyd: Wales (7.5 km), Offa's Dyke: Section from Footpath S of Pen-y-Bryn to Orseddwen (8.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Pen y Gaer Hillfort'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 Gaer Hillfort stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.