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Llandeilo Castle Mound is a medieval motte constructed on bedrock of the South Wales Upper Coal Measures Formation. The underlying geology—a sequence of mudstone, siltstone, sandstone and ironstone laid down during the Westphalian period—provided a firm foundation for the earthwork's construction. This coal-bearing strata has shaped the landscape of the region for millennia, though the ironstone and ferricrete deposits would have remained buried beneath the surface when the castle was built.
The mound represents a characteristic form of Norman military architecture, built to command the locality and provide defensive security. Mottos of this kind typically served as the focal point of early medieval lordship, combining practical defensive capability with visible demonstration of authority. The site's specific location within south Wales reflects the pattern of Anglo-Norman penetration into Welsh territories during the medieval period.
The monument is protected as a scheduled ancient monument under Cadw, the Welsh Historic Monuments service, registered under reference GM200. This status recognises its archaeological significance as evidence of medieval settlement, fortification and social hierarchy. The mound survives as a substantial earthwork, preserving structural information about early medieval military engineering and the imposition of feudal authority across the Welsh landscape.
Llandeilo Castle Mound is a scheduled monument protected by Cadw under reference GM200. View the official record →
Llandeilo Castle Mound is a medieval motte constructed on bedrock of the South Wales Upper Coal Measures Formation. It is designated a Scheduled Ancient Monument by Cadw under reference GM200.
Llandeilo 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.
Llandeilo 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 GM200.
Several scheduled monuments lie within 10 km, including Melin Mynach, Gorseinon (3.6 km), Garn Goch Round Barrow (5 km), Loughor Castle (5.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Llandeilo 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.
Llandeilo Castle Mound stands on South Wales Upper Coal Measures Formation, bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.