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Castell Llain-Fawr is a medieval motte situated in Wales and protected as a scheduled monument by Cadw (reference PE209). The earthwork rises from bedrock composed of Ashgill rocks—mudstone, siltstone and sandstone formations laid down in the Ashgill period. This underlying geology has shaped the motte's construction and stability, with the stone-rich substrate providing a naturally firm foundation for the defensive ringwork.
The monument represents the Norman or early medieval tradition of motte-and-bailey fortification, a prevalent form of military architecture across Wales during the 11th to 13th centuries. Mottes functioned as focal points of territorial control, combining defensive capability with administrative authority over surrounding lands. The raised earthwork would originally have supported timber or stone structures on its summit.
Castell Llain-Fawr's survival as an upstanding earthwork allows it to retain considerable archaeological potential. The motte's form and position within the local landscape reflect strategic considerations typical of medieval fortification sites, whilst its preservation on Ashgill bedrock demonstrates how geological conditions influenced both the engineering and longevity of such defences. It remains an important record of medieval settlement and power in the region.
Castell Llain-Fawr is a scheduled monument protected by Cadw under reference PE209. View the official record →
Castell Llain-Fawr is a medieval motte situated in Wales and protected as a scheduled monument by Cadw (reference PE209).
Castell Llain-Fawr 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 Llain-Fawr 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 PE209.
Several scheduled monuments lie within 10 km, including Standing Stone 600m E of Dolau-Newydd (6.8 km), Rhos Fach standing stone pair (7.1 km), Ty-Newydd Standing Stones (7.1 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Castell Llain-Fawr'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 Llain-Fawr stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.