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Castell Trefilan is a medieval motte situated in Wales, protected by Cadw under reference CD077. The monument occupies a site where Llandovery Rocks—a formation of mudstone, siltstone and sandstone dating to the Llandovery period—form the underlying bedrock. This geology shaped both the construction and survival of the earthwork, as the mixed sedimentary bedrock provided a stable foundation for the motte's substantial earthen mound.
The motte represents a characteristic form of medieval fortification typical of Wales and the borderlands, where they served as strongpoints controlling local territories. The raised platform and its associated ditches would have been cut into and built up from the local soils overlying the Llandovery strata. This elevated position afforded commanding views across the surrounding landscape, essential for a structure designed for defence and territorial assertion during the medieval period.
As a Cadw-protected monument, Castell Trefilan remains a significant record of medieval fortification practices in Wales. The motte's earthwork remains preserve evidence of settlement hierarchy and military organisation during a formative period of Welsh history when such structures proliferated across the landscape. Its survival and statutory protection recognise its archaeological and historical importance as a tangible reminder of medieval power and control.
Castell Trefilan is a scheduled monument protected by Cadw under reference CD077. View the official record →
Castell Trefilan is a medieval motte situated in Wales, protected by Cadw under reference CD077.
Castell Trefilan dates from the medieval period, and is classified as a motte. It is one of over 32,000 scheduled monuments protected across the UK.
Castell Trefilan 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 CD077.
Several scheduled monuments lie within 10 km, including Pen Clawdd-Mawr Defended Enclosure (1.9 km), Castell Cwmere (3.1 km), Cribyn Clottas (5.8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Castell Trefilan'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.
Castell Trefilan stands on Llandovery Rocks (Undifferentiated), bedrock that formed in the Llandovery. The rock here is mudstone, siltstone and sandstone.