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Meini Gwyr is a prehistoric henge monument located in Wales and protected by Cadw as a scheduled ancient monument under reference CM051. The site lies upon bedrock formed from the Whiterock stage of the Ordovician period, comprising mudstone, siltstone and sandstone of the Llanvirn Rocks formation. This solid geology provided the foundation for the monument's construction and continues to underlie the landscape today.
Henges are ritual monuments typically comprising one or more circular earthwork banks and ditches, usually with internal timber or stone settings. Built during the Neolithic and Bronze Age, they served ceremonial and possibly astronomical functions. Meini Gwyr represents an important example of this monument class within the Welsh prehistoric heritage, reflecting the sophisticated understanding of landscape and ceremonial practice among early farming communities.
The protection and recording of Meini Gwyr by Cadw ensures the preservation of this archaeological resource for future study and public access. The monument contributes to our understanding of prehistoric settlement patterns, ritual practices and the relationship between early Welsh communities and their natural environment during the Neolithic and Bronze Age periods.
Meini Gwyr is a scheduled monument protected by Cadw under reference CM051. View the official record →
Meini Gwyr is a prehistoric henge monument located in Wales and protected by Cadw as a scheduled ancient monument under reference CM051.
Meini Gwyr dates from the prehistoric period, and is classified as a henge. It is one of over 32,000 scheduled monuments protected across the UK.
Meini Gwyr 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 CM051.
Several scheduled monuments lie within 10 km, including Crugiau Round Barrows (6.3 km), Inscribed Stone N of Parciau Farmhouse (7.6 km), Gelli Diogyn Hillfort (7.6 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Meini Gwyr'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.
Meini Gwyr stands on Llanvirn Rocks (Undifferentiated), bedrock that formed in the Whiterock. The rock here is mudstone, siltstone and sandstone.