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Pen y Cnap Castle is a medieval motte situated in Wales and protected by Cadw under reference CM151. The earthwork rises from bedrock composed of Ashgill Rocks, undifferentiated strata of mudstone, siltstone and sandstone laid down during the Ashgill period. This geological foundation, typical of many Welsh upland sites, provided a stable base for the castle's construction, though the softer sedimentary rocks would have required careful engineering to support the substantial earthwork.
The motte represents a common form of medieval fortification found throughout Wales and the Welsh Marches. Such structures typically comprised a high, steep-sided mound crowned with a wooden palisade and tower, often accompanied by an outer bailey or defended enclosure. The mound at Pen y Cnap would have served both defensive and administrative purposes, allowing control of the surrounding landscape and demonstration of territorial authority.
The castle's survival as an upstanding earthwork reflects the preservation of such monuments across the Welsh countryside. Although the wooden superstructure has long since perished, the mound's form remains clearly legible in the landscape, providing evidence of medieval settlement patterns and the strategic importance of this location. Its protection under Cadw ensures the preservation of this significant record of Wales's medieval heritage.
Pen y Cnap Castle is a scheduled monument protected by Cadw under reference CM151. View the official record →
Pen y Cnap Castle is a medieval motte situated in Wales and protected by Cadw under reference CM151.
Pen y Cnap Castle dates from the medieval period, and is classified as a motte. It is one of over 32,000 scheduled monuments protected across the UK.
Pen y Cnap Castle 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 CM151.
Several scheduled monuments lie within 10 km, including Maes y Crug round barrow (2.1 km), Castell Dryslwyn (3.9 km), Pen y Garn Camp (6.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Pen y Cnap Castle'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.
Pen y Cnap Castle stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.