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Tomen y Cefnlloer is a medieval motte situated in Wales and protected by Cadw as a scheduled ancient monument under reference MG026. The fortification rises from bedrock composed of Wenlock Rocks—undifferentiated mudstone, siltstone and sandstone deposits laid down during the Wenlock period of the Silurian age. This geological foundation of interbedded fine-grained sediments would have provided a naturally stable base for the mound's construction, though the varied composition of the underlying strata may have presented challenges for drainage on the steeper slopes typical of motte sites.
As a motte, the monument represents the simplest form of medieval fortification, comprising an artificial earthen mound that likely once supported a timber palisade and central stronghold. Such structures proliferated across Wales and the Anglo-Norman frontier during the eleventh and twelfth centuries, serving as administrative centres, garrison posts and symbols of lordship in newly conquered or contested territory.
The specific character of Tomen y Cefnlloer is shaped by its local setting on Wenlock geology, which differs from the carboniferous limestone and old red sandstone foundations of other Welsh mottes. This geological distinctiveness, combined with the monument's surviving earthwork form, preserves evidence of medieval settlement strategy adapted to the particular landscape and resources of its region.
Tomen y Cefnlloer is a scheduled monument protected by Cadw under reference MG026. View the official record →
Tomen y Cefnlloer is a medieval motte situated in Wales and protected by Cadw as a scheduled ancient monument under reference MG026.
Tomen y Cefnlloer dates from the medieval period, and is classified as a motte. It is one of over 32,000 scheduled monuments protected across the UK.
Tomen y Cefnlloer 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 MG026.
Several scheduled monuments lie within 10 km, including Aber-Naint Dyke (1 km), Ty-Newydd Dyke (1.7 km), Tomen yr Allt Castle Mound (1.7 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Tomen y Cefnlloer'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.
Tomen y Cefnlloer stands on Wenlock Rocks (Undifferentiated), bedrock that formed in the Wenlock. The rock here is mudstone, siltstone and sandstone.