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Peterston Castle is a medieval castle situated in Wales and designated as a Scheduled Ancient Monument under Cadw reference GM450. The site occupies ground underlain by Lias Group rocks of Aalenian age, a sequence of mudstone, siltstone, limestone and sandstone that would have provided both building material and challenges for construction in the medieval period.
The castle remains represent a phase of Norman settlement and fortification across Wales, though the exposed geology of the Lias bedrock would have required careful engineering of foundations and defences. The mixed lithology of the underlying strata—combining softer mudstones and siltstones with harder limestone and sandstone layers—created variable conditions across the site that builders would have needed to navigate.
Now protected by Cadw, the surviving remains preserve evidence of medieval castle architecture and occupation. The site's geological setting on Aalenian deposits has shaped both its archaeological record and its present topography, with the weathered bedrock having influenced patterns of medieval settlement and the survival of structures to the present day.
Remains of Peterston Castle is a scheduled monument protected by Cadw under reference GM450. View the official record →
Peterston Castle is a medieval castle situated in Wales and designated as a Scheduled Ancient Monument under Cadw reference GM450.
Remains of Peterston Castle dates from the medieval period, and is classified as a castle. It is one of over 32,000 scheduled monuments protected across the UK.
Remains of Peterston 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 GM450.
Several scheduled monuments lie within 10 km, including Penmark Castle (7.9 km), Barry Castle (9.4 km), Site of Medieval Mill & Mill Leat Cliffwood (9.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Remains of Peterston 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.
Remains of Peterston Castle stands on Lias Group, bedrock that formed in the Aalenian. The rock here is mudstone, siltstone, limestone and sandstone.