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Castell Caerau is a prehistoric hillfort located in Wales and protected as an ancient monument by Cadw under reference CN044. The fort occupies a commanding hilltop position where the underlying bedrock consists of Ordovician felsic tuff, an extrusive igneous rock formed during the Ordovician period when volcanic activity dominated this region of Wales. This ancient volcanic foundation provided a naturally elevated and defensible location for settlement.
The hillfort demonstrates the characteristic defensive strategy of Iron Age and earlier communities, who selected high ground to maximise visibility across surrounding terrain and create natural barriers against approach. The Ordovician bedrock, exposed in places across the hilltop, would have offered stone suitable for constructing fortification walls and domestic structures.
Castell Caerau represents an important phase in Welsh prehistory when hillforts served as population centres, administrative hubs and refuges. Its positioning on the volcanic bedrock of this upland area reflects the inhabitants' sophisticated understanding of landscape, geology and defensive principles. The site remains a significant archaeological resource, with its preserved earthworks providing evidence of prehistoric settlement patterns and social organisation in Wales.
Castell Caerau is a scheduled monument protected by Cadw under reference CN044. View the official record →
Castell Caerau is a prehistoric hillfort located in Wales and protected as an ancient monument by Cadw under reference CN044.
Castell Caerau dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across the UK.
Castell Caerau 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 CN044.
Several scheduled monuments lie within 10 km, including Cefn-Isaf Burial Chamber (3.9 km), Capel Gallt-Coed (5.2 km), Standing Stone N of Bettws Fawr (5.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Castell Caerau'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.
Castell Caerau stands on Unnamed Extrusive Rocks, Ordovician, bedrock that formed in the Ordovician. The rock here is felsic tuff.