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Plas-y-Gaer Camp is a prehistoric hillfort located in Wales and protected by Cadw under reference BR154. The monument occupies a defensible hilltop position whose underlying geology consists of Lower Devonian rocks of undifferentiated character—a succession of mudstone, siltstone and sandstone laid down during the Early Devonian period. These consolidated sedimentary strata provided a stable foundation for the fort's construction and would have offered naturally sloping terrain advantageous to its defensive design.
The hillfort exemplifies the iron age settlement pattern established across Wales, where communities chose elevated positions to command their surrounding landscape. The bedrock composition of mudstone and siltstone would have influenced the character of soil development on the hilltop, affecting both the fort's drainage and the ease with which its builders could construct defensive earthworks and ditches.
Plas-y-Gaer Camp remains an important archaeological record of prehistoric highland settlement and territorial control in Wales. Its survival, secured through Cadw's protection, preserves evidence of the strategic and social organisation that characterised iron age communities, whose choice of location at this particular hilltop was shaped by both the defensive opportunities the landform presented and the geological substrate beneath it.
Plas-y-Gaer Camp is a scheduled monument protected by Cadw under reference BR154. View the official record →
Plas-y-Gaer Camp is a prehistoric hillfort located in Wales and protected by Cadw under reference BR154.
Plas-y-Gaer Camp dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across the UK.
Plas-y-Gaer Camp 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 BR154.
Several scheduled monuments lie within 10 km, including Cwm Cwareli Longhouse and Long Hut (3.8 km), Blaen Glyn Round Cairn (6.3 km), Lower Neuadd Standing Stone (6.8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Plas-y-Gaer Camp'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.
Plas-y-Gaer Camp stands on Lower Devonian Rocks (Undifferentiated), bedrock that formed in the Early Devonian. The rock here is mudstone, siltstone and sandstone.