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Castell Henllys is a Iron Age hillfort situated near Crymych in Pembrokeshire, Wales, dating to approximately the first century BCE. The site comprises a substantial defensive settlement enclosed by multiple ramparts and ditches, with evidence suggesting occupation during the late Iron Age and possibly into the Roman period. Excavations have revealed domestic structures including roundhouses, storage pits, and artefactual material indicative of a significant Iron Age community, making it one of the more thoroughly investigated hillforts in Wales. The monument's physical remains, together with its archaeological deposits, provide important evidence for understanding settlement patterns, domestic life, and defensive strategies among Iron Age communities in southwest Wales.
Castell Henllys is a scheduled monument protected by Cadw under reference PE175. View the official record →
Castell Henllys is a Iron Age hillfort situated near Crymych in Pembrokeshire, Wales, dating to approximately the first century BCE. It is designated a Scheduled Ancient Monument by Cadw under reference PE175.
Castell Henllys 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 Henllys 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 PE175.
Several scheduled monuments lie within 10 km, including Waun Clyn-Coch Hut Group (7.8 km), Ty-Newydd Standing Stones (8 km), Foel Cwm-Cerwyn Round Cairns (8.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Castell Henllys'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 Henllys stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.