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Twm-Barlwm Mound and Bailey Castle is a medieval motte and bailey fortification located in Wales and protected by Cadw under reference MM044. The castle occupies ground underlain by the Pennine and South Wales Middle Coal Measures Formation, a sequence of mudstones, siltstones and sandstones deposited during the Moscovian age, interspersed with coal seams, ironstone and ferricrete layers. This coal-bearing bedrock would have influenced both the landscape's appearance and the choice of this elevated position for the stronghold.
The motte comprises a raised earthwork surmounted by a palisaded ringwork, typical of Norman and early medieval fortifications established to control territory and movement through the Welsh landscape. The adjoining bailey would have provided an outer defended enclosure for administrative, residential and storage functions. Such castles frequently exploited natural topography to maximize defensive advantage.
The monument's survival on this industrially significant coal-bearing geology reflects the enduring strategic importance of elevated positions for territorial control, a principle that defined motte and bailey castle placement across medieval Britain and Wales alike.
Twm-Barlwm Mound and Bailey Castle is a scheduled monument protected by Cadw under reference MM044. View the official record →
Twm-Barlwm Mound and Bailey Castle is a medieval motte and bailey fortification located in Wales and protected by Cadw under reference MM044.
Twm-Barlwm Mound and 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.
Twm-Barlwm Mound and 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 MM044.
Several scheduled monuments lie within 10 km, including Ruperra Hillfort and Motte (6.2 km), Ruperra Castle lower summerhouse remains (6.3 km), Croes Carn Einion Roman Site (6.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Twm-Barlwm Mound and 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.
Twm-Barlwm Mound and Bailey Castle stands on Pennine Middle Coal Measures Formation And South Wales Middle Coal Measures Formation (Undifferentiated), bedrock that formed in the Moscovian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.