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Trefenty Mound and Bailey Castle is a medieval motte and bailey earthwork situated in Wales and protected by Cadw as a scheduled monument under reference CM143. The site exploits the local geology to advantage: it is founded upon Ashgill Rocks, an undifferentiated sequence of mudstone, siltstone and sandstone deposited during the Ashgill period. These competent, well-bedded sediments provided stable ground for the construction and long-term preservation of the defensive earthworks.
The monument consists of the characteristic two-part plan typical of motte and bailey castles, a fortification type introduced to Britain following the Norman Conquest and widely adopted throughout Wales during the medieval period. The motte forms the primary stronghold, whilst the adjacent bailey provided protected space for domestic, military and agricultural activities. The earthwork's survival owes much to its remote location and the resistant nature of the underlying bedrock, which has prevented significant erosion despite centuries of exposure to Welsh weather.
The site represents an important phase in medieval military architecture and settlement, marking Norman influence and control within the Welsh landscape. Though now denuded of any substantial stone or timber structures, the earthwork's clear definition allows the original layout and strategic positioning to remain readily legible. Trefenty Mound and Bailey Castle stands as testament to the engineering practices and defensive priorities of its medieval builders.
Trefenty Mound and Bailey Castle is a scheduled monument protected by Cadw under reference CM143. View the official record →
Trefenty Mound and Bailey Castle is a medieval motte and bailey earthwork situated in Wales and protected by Cadw as a scheduled monument under reference CM143.
Trefenty Mound and Bailey Castle dates from the medieval period, and is classified as a motte and bailey. It is one of over 32,000 scheduled monuments protected across the UK.
Trefenty Mound and Bailey 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 CM143.
Several scheduled monuments lie within 10 km, including Delacorse Uchaf Standing Stone (2.1 km), Hillslope Enclosure at Laugharne Park Holiday Village (2.5 km), Laugharne Castle (2.8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Trefenty Mound and Bailey 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.
Trefenty Mound and Bailey Castle stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.