© Mapbox · © OpenStreetMap contributors · Boundary data © Cadw
Ty'n-y-Celyn Castle Mound is a medieval motte constructed on bedrock of Caradoc Rocks, a formation of mudstone, siltstone and sandstone that provides a naturally stable foundation for defensive earthworks. The mound rises prominently from the Welsh landscape, representing the characteristic twelfth-century Norman strategy of establishing military control through elevated strongholds. Its position exploits the underlying geology, which offered ready materials for construction whilst the sloping terrain could be shaped into a defensive embankment.
The motte's form reflects standard medieval fortification design: a truncated conical earthwork serving as a stronghold from which surrounding territory could be monitored and defended. The monument stands as evidence of the period when Norman lords advanced into Wales, establishing castles at strategic locations to consolidate their territorial gains and impose military authority over newly conquered lands.
Protected by Cadw, the monument remains an important archaeological resource. The Caradoc Rocks bedrock that underlies the site, deposited during the Ordovician period, continues to influence the monument's preservation and the character of its immediate surroundings, anchoring this medieval structure within the deep geological history of Wales.
Ty'n-y-Celyn Castle Mound is a scheduled monument protected by Cadw under reference MG028. View the official record →
Ty'n-y-Celyn Castle Mound is a medieval motte constructed on bedrock of Caradoc Rocks, a formation of mudstone, siltstone and sandstone that provides a naturally stable foundation for defensive earthworks. It is designated a Scheduled Ancient Monument by Cadw under reference MG028.
Ty'n-y-Celyn 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.
Ty'n-y-Celyn 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 MG028.
Several scheduled monuments lie within 10 km, including Llanrhaeadr-ym-Mochnant Crop Marks W of Meusydd Smithy (3.1 km), Maes-Mochnant Standing Stone (3.5 km), Maes Mochnant Isaf Round Barrow (3.6 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Ty'n-y-Celyn 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.
Ty'n-y-Celyn Castle Mound stands on Caradoc Rocks (Undifferentiated), bedrock that formed in the Caradocian. The rock here is mudstone, siltstone and sandstone.