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Pen y Crogben Earthwork is a Roman enclosure situated in Wales, strategically positioned on geology formed from Llandovery rocks of mudstone, siltstone and sandstone. The site lies within the landscape of Roman military interest in Wales, where such earthwork enclosures served as temporary or auxiliary installations during the imperial campaigns and occupation of the region. The bedrock composition of the site reflects the challenging terrain that characterised this upland zone.
The enclosure is defined by earthwork banks and ditches that would have functioned as defensive barriers and boundary markers typical of Roman auxiliary installations. The scale and layout of the site indicate its role within the broader Roman military infrastructure established across Wales during the first and second centuries AD. The mudstone and siltstone geology beneath the site provided a firm but weatherable foundation for such constructed defences.
Pen y Crogben Earthwork is protected by Cadw, the Welsh Historic Monuments service, under the reference MG106. This designation recognises its significance as an archaeological monument of national importance and ensures the preservation of the earthwork for future study and understanding of Roman military occupation and settlement patterns in Wales.
Pen y Crogben Earthwork is a scheduled monument protected by Cadw under reference MG106. View the official record →
Pen y Crogben Earthwork is a Roman enclosure situated in Wales, strategically positioned on geology formed from Llandovery rocks of mudstone, siltstone and sandstone. It is designated a Scheduled Ancient Monument by Cadw under reference MG106.
Pen y Crogben Earthwork dates from the roman period, and is classified as a enclosure. It is one of over 32,000 scheduled monuments protected across the UK.
Pen y Crogben Earthwork 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 MG106.
Several scheduled monuments lie within 10 km, including Barrow Group W of Staylittle (3.2 km), Hengwm Ring Cairns (4.1 km), Carn Fach Bugeilyn (4.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Pen y Crogben Earthwork'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.
Pen y Crogben Earthwork stands on Llandovery Rocks (Undifferentiated), bedrock that formed in the Llandovery. The rock here is mudstone, siltstone and sandstone.