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Arthur's Stone is a prehistoric chambered tomb situated on Cefn Bryn in Wales. The monument consists of a substantial stone burial chamber constructed from large orthostatic slabs, typical of Neolithic communal tombs built across Britain and Ireland during the fourth millennium BC. The capstone, a massive naturally fractured slab, crowns the chamber and has become the defining feature of the site. The monument is protected by Cadw under reference GM003.
The tomb was constructed upon bedrock composed of Dinantian rocks, a formation of Mississippian age dominated by limestone with subordinate sandstone and argillaceous strata. This geology shaped both the choice of location and the building materials available to the tomb's constructors. The limestone geology of the upland landscape would have provided suitable stone for the orthostatic chamber walls, whilst the elevated position of Cefn Bryn afforded commanding views across the surrounding terrain.
Arthur's Stone represents a significant investment in labour and communal organisation, reflecting the social and ritual importance of the dead in Neolithic Welsh society. The monument continues to dominate the landscape as it has for over five thousand years, standing as testimony to the permanence and status its builders sought to establish through monumental stone construction.
Arthur's Stone, Cefn Bryn is a scheduled monument protected by Cadw under reference GM003. View the official record →
Arthur's Stone is a prehistoric chambered tomb situated on Cefn Bryn in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM003.
Arthur's Stone, Cefn Bryn dates from the prehistoric period, and is classified as a chambered tomb. It is one of over 32,000 scheduled monuments protected across the UK.
Arthur's Stone, Cefn Bryn 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 GM003.
Several scheduled monuments lie within 10 km, including Limestone Quarry and Kiln at Oxwich (4.2 km), Tower NE of Oxwich Castle (4.2 km), Castell Oxwich (4.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Arthur's Stone, Cefn Bryn'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.
Arthur's Stone, Cefn Bryn stands on Dinantian Rocks (Undifferentiated), bedrock that formed in the Mississippian. The rock here is limestone with subordinate sandstone and argillaceous rocks.