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Dinas Cerdin is a prehistoric hillfort situated in Wales, its defences and occupation levels built upon the Ashgill Rocks that underlie the site. These bedrock formations of mudstone, siltstone and sandstone, laid down during the Ashgill geological period, provided the natural foundation for settlement. The hillfort's position would have exploited the local topography, using the natural contours of this geological base to strengthen its defensive capabilities.
The site represents a significant phase of prehistoric settlement in the Welsh landscape, typical of hillforts that emerged during the Iron Age as centres of power, refuge and economic activity. Such fortifications were characterised by ramparts and ditches that followed the natural ridge lines and slopes, creating imposing barriers against approach. The underlying geology would have influenced both the construction methods available and the stability of the defensive works.
Dinas Cerdin is protected as a scheduled monument under Cadw, the Welsh Historic Monuments organisation, ensuring its preservation and archaeological integrity. This designation reflects its importance to understanding prehistoric settlement patterns and fortification strategies in Wales. The site remains a valuable record of Iron Age communities and their exploitation of the Welsh uplands, with its fabric still preserving evidence of the ancient engineering and territorial ambitions of its builders.
Dinas Cerdin is a scheduled monument protected by Cadw under reference CD016. View the official record →
Dinas Cerdin is a prehistoric hillfort situated in Wales, its defences and occupation levels built upon the Ashgill Rocks that underlie the site. It is designated a Scheduled Ancient Monument by Cadw under reference CD016.
Dinas Cerdin dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across the UK.
Dinas Cerdin 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 CD016.
Several scheduled monuments lie within 10 km, including St Mary's Church / Llandyfriog Castle Mound (5.1 km), Castell Nant-y-Garan (5.1 km), Pen Coed-Foel Camp (5.7 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Dinas Cerdin'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.
Dinas Cerdin stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.