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Twyn y Cregen Castle Mound is a medieval motte located in Wales and protected by Cadw under reference MM080. The earthwork rises from Pridoli bedrock composed of mudstone, siltstone and sandstone, geological formations that would have influenced both the construction technique and the stability of the fortification. Like other Welsh mottes of the Norman and post-Norman period, this mound represents a practical and rapid method of establishing territorial control, with its elevated position offering command over surrounding terrain and strategic visibility across the landscape.
The monument's survival on the Pridoli geology demonstrates how this mixed substrate, while prone to weathering, provided sufficient stability for the substantial earthwork's foundations. The composition of the underlying rocks—layered silts and muds interspersed with sandstone bands—would have offered reasonable bearing capacity, though the builders would have needed to account for drainage challenges inherent in such materials. The motte's form reflects the established design conventions of medieval castle engineering, whereby the height of the mound served both defensive and administrative purposes within the settlement hierarchy of the region.
Today Twyn y Cregen Castle Mound survives as a landscape monument recording medieval Wales's patterns of settlement and control. Its protection reflects the historical significance of motte-and-bailey fortifications in understanding Norman and Welsh territorial organisation during the medieval period.
Twyn y Cregen Castle Mound is a scheduled monument protected by Cadw under reference MM080. View the official record →
Twyn y Cregen Castle Mound is a medieval motte located in Wales and protected by Cadw under reference MM080.
Twyn y Cregen Castle Mound dates from the medieval period, and is classified as a motte. It is one of over 32,000 scheduled monuments protected across the UK.
Twyn y Cregen Castle Mound 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 MM080.
Several scheduled monuments lie within 10 km, including Coed y Bwnydd Camp (2.9 km), St Mary's Yard Castle Mound (3 km), Bettws Newydd Churchyard Cross-Base (3.8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Twyn y Cregen Castle Mound'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 y Cregen Castle Mound stands on Pridoli Rocks (Undifferentiated), bedrock that formed in the Pridoli. The rock here is mudstone, siltstone and sandstone.