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Llys Gwenllian Mound and Bailey is a medieval motte and bailey castle located in Wales and protected by Cadw as a scheduled monument under reference DE019. The site comprises a substantial earthwork consisting of a raised mound, or motte, surrounded by defensive ditches and an outer bailey enclosure typical of Norman military architecture introduced to Wales in the eleventh and twelfth centuries. The monument is constructed upon bedrock of Permian sandstone and conglomerate, interbedded formations that underlie the locality and would have provided a stable foundation for the earthwork's construction.
The castle's name references Gwenllian, a notable figure in Welsh medieval history, linking the fortification to local territorial significance during the period of Anglo-Norman expansion into Wales. The motte and bailey design reflects military priorities of rapid construction and defensive strength, with the raised central mound serving as a stronghold whilst the adjoining bailey provided space for domestic buildings, garrison facilities and animal pens. This layout made efficient use of the Permian bedrock substrate whilst creating multiple defensive barriers against attack.
Today the earthwork remains a substantial and recognisable feature of the Welsh landscape, its form largely unaltered since medieval times. The mound and surrounding ditches survive as important archaeological evidence of castle design and settlement patterns during Wales's medieval period, contributing to understanding of Norman military strategy and Welsh territorial organisation.
Llys Gwenllian Mound & Bailey is a scheduled monument protected by Cadw under reference DE019. View the official record →
Llys Gwenllian Mound and Bailey is a medieval motte and bailey castle located in Wales and protected by Cadw as a scheduled monument under reference DE019.
Llys Gwenllian Mound & Bailey dates from the medieval period, and is classified as a motte and bailey. It is one of over 32,000 scheduled monuments protected across the UK.
Llys Gwenllian Mound & Bailey 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 DE019.
Several scheduled monuments lie within 10 km, including Denbigh Castle (1.4 km), Denbigh Town Walls (1.5 km), Civil War Earthworks (1.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Llys Gwenllian Mound & Bailey'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.
Llys Gwenllian Mound & Bailey stands on Permian Rocks (Undifferentiated), bedrock that formed in the Permian. The rock here is sandstone and conglomerate, interbedded.