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Craig yr Aderyn Hillfort is a prehistoric hillfort located in Wales, occupying a naturally elevated position underlain by Ordovician extrusive rocks, specifically felsic tuff deposits formed during the Ordovician period. The hard volcanic bedrock would have provided a stable foundation for the construction and defence of the site. The hillfort is protected as a scheduled monument under Cadw, the Welsh Historic Monuments service, registered under reference ME075.
The site demonstrates the strategic principles typical of Iron Age hillforts across Britain and Wales, where elevated terrain offering commanding views of surrounding lowlands made ideal locations for settlement and defensive purposes. The exposed felsic tuff bedrock characteristic of this area would have influenced both the construction methods available to its inhabitants and the monument's long-term preservation.
Today, Craig yr Aderyn Hillfort remains an important archaeological site within Wales's heritage landscape, contributing to understanding of prehistoric settlement patterns and defensive strategies in the region. Its protected status ensures ongoing preservation of both the visible earthworks and the archaeological deposits contained within and around the monument.
Craig yr Aderyn Hillfort is a scheduled monument protected by Cadw under reference ME075. View the official record →
Craig yr Aderyn Hillfort is a prehistoric hillfort located in Wales, occupying a naturally elevated position underlain by Ordovician extrusive rocks, specifically felsic tuff deposits formed during the Ordovician period. It is designated a Scheduled Ancient Monument by Cadw under reference ME075.
Craig yr Aderyn 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.
Craig yr Aderyn 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 ME075.
Several scheduled monuments lie within 10 km, including Tarren Hendre Cairn (4.8 km), Crop marks (revealed by Aerial photography) SE of Pen-y-Sarn, Bryn-Crug (5.4 km), Waen Fach Standing Stone (5.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Craig yr Aderyn 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.
Craig yr Aderyn Hillfort stands on Unnamed Extrusive Rocks, Ordovician, bedrock that formed in the Ordovician. The rock here is felsic tuff.