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Polyn y Groes-Ddu Round Barrow, Waun Lluest Owain is a prehistoric round barrow situated in Wales and protected by Cadw under the reference MG086. The monument was constructed upon bedrock of Wenlock Rocks, comprising interbedded sandstone and conglomerate deposits formed during the Wenlock period. These durable stone foundations would have provided a stable base for the earthwork mound, though the builders would have drawn construction materials from the surrounding landscape rather than the hard bedrock itself.
Round barrows of this type typically date to the Bronze Age and served as burial monuments for individuals of status within prehistoric communities. The mound would originally have been substantially more prominent than its current condition, with its form gradually reduced by erosion, ploughing and natural settlement over millennia. The Wenlock Rocks underlying the site represent ancient marine sediments, indicating that this upland location once lay beneath shallow seas hundreds of millions of years before the barrow's construction.
Today, the monument remains an important archaeological record of Bronze Age burial practice in Wales. Its preservation under Cadw protection ensures that this landscape feature, together with the geological substrate upon which it stands, continues to inform understanding of prehistoric settlement and ceremonial activity in the region.
Polyn y Groes-Ddu Round Barrow, Waun Lluest Owain is a scheduled monument protected by Cadw under reference MG086. View the official record →
Polyn y Groes-Ddu Round Barrow, Waun Lluest Owain is a prehistoric round barrow situated in Wales and protected by Cadw under the reference MG086.
Polyn y Groes-Ddu Round Barrow, Waun Lluest Owain dates from the prehistoric period, and is classified as a round barrow. It is one of over 32,000 scheduled monuments protected across the UK.
Polyn y Groes-Ddu Round Barrow, Waun Lluest Owain 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 MG086.
Several scheduled monuments lie within 10 km, including Fuallt Standing Stone (4.3 km), Fowler's Arm Chair Stone Circle & Round Cairns, Banc Du (4.5 km), Bryn Hafod Standing Stone (4.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Polyn y Groes-Ddu Round Barrow, Waun Lluest Owain'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.
Polyn y Groes-Ddu Round Barrow, Waun Lluest Owain stands on Wenlock Rocks (Undifferentiated), bedrock that formed in the Wenlock. The rock here is sandstone and conglomerate, interbedded.