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Caerleon Castle Mound is a medieval motte built on bedrock of Lower Devonian mudstone, siltstone and sandstone. The mound occupies a strategically significant location in Wales, constructed during the Norman period when castles of this type were raised across Welsh territories to project power and control the landscape. The mound rises from geological foundations laid down nearly 400 million years ago when this region lay submerged beneath ancient seas. The hard, layered Devonian rocks would have provided a stable base for the earthwork defences, though the motte itself was constructed from soil and stone quarried from the surrounding area.
This monument represents a common military response to the challenges of establishing Norman authority in medieval Wales. Mottes such as this typically supported a timber palisade and fighting platform, with a bailey or outer courtyard below. The site's position reflects careful selection of defensible high ground combined with practical access and water supply considerations.
The mound is now protected by Cadw, the Welsh heritage organisation, ensuring its preservation as evidence of medieval military strategy and settlement patterns. The combination of Norman engineering and Welsh geography preserved here illuminates the complex processes of conquest and control that shaped medieval Britain.
Caerleon Castle Mound is a scheduled monument protected by Cadw under reference MM014. View the official record →
Caerleon Castle Mound is a medieval motte built on bedrock of Lower Devonian mudstone, siltstone and sandstone. It is designated a Scheduled Ancient Monument by Cadw under reference MM014.
Caerleon 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.
Caerleon 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 MM014.
Several scheduled monuments lie within 10 km, including St Julian's Wood Camp (1.4 km), Newport Castle (3.7 km), St. Mary's Churchyard Cross, Llanwern (3.9 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Caerleon 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.
Caerleon Castle Mound stands on Lower Devonian Rocks (Undifferentiated), bedrock that formed in the Early Devonian. The rock here is mudstone, siltstone and sandstone.