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Tredegar Fort is a prehistoric hillfort built upon Lower Devonian bedrock, which underlies the Welsh landscape with mudstone, siltstone and sandstone laid down in the Early Devonian period. The fort occupies a strategically positioned elevation, its defences following the natural contours afforded by the underlying geological foundation. This solid base of ancient sedimentary rock provided both a practical platform for construction and natural advantages for settlement and defence.
The hillfort's fortifications consist of substantial earthwork ramparts typical of Iron Age construction, commanding views across the surrounding terrain. The choice of this particular hilltop reflects the strategic thinking of its builders, who selected a location offering both defensive strength and control of the landscape. The Lower Devonian rocks beneath—compacted layers of ancient marine sediment—have weathered into slopes suitable for settlement.
Tredegar Fort remains a protected ancient monument under Cadw reference MM084, Wales's historic monuments register. The site preserves evidence of a significant prehistoric settlement phase, with its surviving ramparts still clearly visible in the modern landscape. As with many Welsh hillforts, it represents a crucial period of social organisation and territorial control during the later prehistoric period.
Tredegar Fort is a scheduled monument protected by Cadw under reference MM084. View the official record →
Tredegar Fort is a prehistoric hillfort built upon Lower Devonian bedrock, which underlies the Welsh landscape with mudstone, siltstone and sandstone laid down in the Early Devonian period. It is designated a Scheduled Ancient Monument by Cadw under reference MM084.
Tredegar Fort dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across the UK.
Tredegar Fort 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 MM084.
Several scheduled monuments lie within 10 km, including Castell Glas Castle Mound (1.6 km), Coed y Defaid Camp (1.7 km), Gwern y Cleppa Burial Chamber (2.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Tredegar Fort'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.
Tredegar Fort stands on Lower Devonian Rocks (Undifferentiated), bedrock that formed in the Early Devonian. The rock here is mudstone, siltstone and sandstone.