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Twyn Llechfaen Hillfort is a prehistoric fortified settlement in Wales, constructed on bedrock of Lower Devonian rocks comprising mudstone, siltstone and sandstone formed during the Early Devonian period. The site exploits the natural topography of this ancient geology to create a defensible position. As a hillfort, it represents a significant phase of prehistoric settlement and organisation in Wales, when such elevated fortifications became focal points for community life, storage and protection.
The monument sits within a landscape shaped by Devonian geology, where the underlying sedimentary rocks would have influenced both the hill's form and the availability of building stone for the fortification's defences. Hillforts of this type typically date to the Iron Age, though some may have earlier origins or later reoccupation. Their construction required considerable communal effort, indicating organised societies with the resources to mobilise labour and the social structures to coordinate large-scale building works.
Twyn Llechfaen Hillfort is protected and scheduled as an ancient monument under Cadw, the Welsh Historic Monuments service, with reference BR247. This legal protection recognises its importance to understanding prehistoric Welsh society, settlement patterns and the relationship between human communities and their natural environment. The site remains a significant archaeological and historical resource within its landscape.
Twyn Llechfaen Hillfort is a scheduled monument protected by Cadw under reference BR247. View the official record →
Twyn Llechfaen Hillfort is a prehistoric fortified settlement in Wales, constructed on bedrock of Lower Devonian rocks comprising mudstone, siltstone and sandstone formed during the Early Devonian period. It is designated a Scheduled Ancient Monument by Cadw under reference BR247.
Twyn Llechfaen 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.
Twyn Llechfaen 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 BR247.
Several scheduled monuments lie within 10 km, including Early Medieval Cross in St Brynach’s Church, Llanfrynach (3.4 km), Coed y Caerau Camp (5.3 km), Coed y Brenin Enclosure (5.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Twyn Llechfaen 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.
Twyn Llechfaen Hillfort stands on Lower Devonian Rocks (Undifferentiated), bedrock that formed in the Early Devonian. The rock here is mudstone, siltstone and sandstone.