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Hen Blas Castle Site is a medieval castle situated on Millstone Grit Group bedrock in Wales. The underlying geology of mudstone, siltstone and sandstone formed during the Namurian period, providing a solid foundation for fortification. The site lies within terrain typical of medieval Welsh castle landscapes, where defensive positions were selected with regard to both natural topography and available building stone.
The castle remains are now protected as a scheduled ancient monument under Cadw, the Welsh government's historic monuments service, and are registered under reference FL062. This designation reflects the site's significance as a record of medieval Welsh settlement and military architecture. The Millstone Grit bedrock would have offered suitable material for construction, though the extent to which local stone was quarried for the castle's walls remains part of the site's archaeological character.
Today, the monument survives as earthwork remains or structural fragments indicative of its medieval period. Like many Welsh castles of the period, Hen Blas Castle Site represents the fortified landscape that developed across Wales during the medieval centuries, serving the defensive and administrative needs of its time. The protection afforded by Cadw ensures the site's preservation for future study and public heritage value.
Hen Blas Castle Site is a scheduled monument protected by Cadw under reference FL062. View the official record →
Hen Blas Castle Site is a medieval castle situated on Millstone Grit Group bedrock in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference FL062.
Hen Blas Castle Site dates from the medieval period, and is classified as a castle. It is one of over 32,000 scheduled monuments protected across the UK.
Hen Blas Castle Site 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 FL062.
Several scheduled monuments lie within 10 km, including Wat's Dyke: Section from Chester-Holywell Road to Soughton Farm (6.1 km), Wat's Dyke: Section SE of Clawdd Offa (6.9 km), Round Barrow 450m E of Penbedw Hall (7.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Hen Blas Castle Site'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.
Hen Blas Castle Site stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.