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Llangwm Mound and Bailey Castle is a medieval motte and bailey earthwork situated in Wales and protected as a scheduled monument under Cadw reference MM061. The castle occupies a prominent position on bedrock composed of Lower Devonian rocks—undifferentiated mudstone, siltstone and sandstone deposited during the Early Devonian period. This geological foundation of alternating fine-grained sediments provided a stable base for medieval fortification, though the softer Devonian strata would have required careful engineering to support the substantial earthen mound characteristic of motte and bailey design.
The motte, the dominant feature of the site, rises as an artificial or partially artificial mound constructed to elevate the defensive strongpoint above the surrounding terrain. The bailey, the associated outer courtyard, would have been defended by a ditch and palisade, creating a two-part fortification typical of post-Norman Conquest military architecture in Britain and Wales. Such castles served crucial roles in territorial control and administration throughout the medieval period.
The monument survives as an earthwork monument, preserving evidence of medieval military strategy and settlement patterns in Wales. The survival of the mound and bailey form, despite centuries of exposure to weathering and agricultural activity on Devonian bedrock, demonstrates the robustness of medieval earthwork construction and the site's continued landscape significance.
Llangwm Mound & Bailey Castle is a scheduled monument protected by Cadw under reference MM061. View the official record →
Llangwm Mound and Bailey Castle is a medieval motte and bailey earthwork situated in Wales and protected as a scheduled monument under Cadw reference MM061.
Llangwm Mound & Bailey Castle dates from the medieval period, and is classified as a motte. It is one of over 32,000 scheduled monuments protected across the UK.
Llangwm Mound & Bailey Castle 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 MM061.
Several scheduled monuments lie within 10 km, including Talgarth settlement earthworks (7.8 km), Five Lanes Roman Site (9 km), Round Barrow 250m North East of Five Lanes (9.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Llangwm Mound & Bailey Castle'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.
Llangwm Mound & Bailey Castle stands on Lower Devonian Rocks (Undifferentiated), bedrock that formed in the Early Devonian. The rock here is mudstone, siltstone and sandstone.