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Castell Perthi-Mawr is a prehistoric hillfort situated in Wales and protected by Cadw under reference CD062. The site occupies ground underlain by Llandovery Rocks, a formation of interbedded sandstone and conglomerate deposited during the Llandovery epoch. This geology provided both a defensible position and stone suitable for construction of the hillfort's ramparts.
The monument represents the Iron Age tradition of hillforts constructed across Wales and the broader British Isles. Such sites typically served multiple purposes: as defended settlements, livestock enclosures and centres of local authority. The hillfort's location on this geological foundation would have offered natural strength whilst the local stone resources allowed for the building of substantial earthwork and stone defences.
The precise form and condition of Castell Perthi-Mawr's defences, and the extent of domestic or administrative occupation within, reflect patterns common to Welsh hillforts of the period. Archaeological evidence from comparable sites suggests these monuments remained significant features of the landscape from their construction through the Roman period and beyond, representing enduring focal points for communities across the region.
Castell Perthi-Mawr is a scheduled monument protected by Cadw under reference CD062. View the official record →
Castell Perthi-Mawr is a prehistoric hillfort situated in Wales and protected by Cadw under reference CD062.
Castell Perthi-Mawr dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across the UK.
Castell Perthi-Mawr 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 CD062.
Several scheduled monuments lie within 10 km, including Llan-Llyr Inscribed Stone (3.4 km), Pen Clawdd-Mawr Defended Enclosure (4.5 km), Castell Cwmere (4.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Castell Perthi-Mawr'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.
Castell Perthi-Mawr stands on Llandovery Rocks (Undifferentiated), bedrock that formed in the Llandovery. The rock here is sandstone and conglomerate, interbedded.