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Three Round Cairns on the Southern Side of Mynydd-y-Glog is a Bronze Age funerary monument comprising three separate cairns constructed on moorland in Wales. The cairns sit upon bedrock of the Millstone Grit Group, a Namurian formation of mudstone, siltstone and sandstone that characterises this upland landscape. This geology would have presented a challenging building environment, yet prehistoric communities selected this elevated location for their burial monuments, suggesting the site held considerable significance for local populations.
The three cairns represent a clustering typical of Bronze Age burial practices, where multiple generations or family groups were commemorated within the same ceremonial landscape. Round cairns of this period generally contained central burial chambers, though their precise internal structures at this site remain undocumented. The moorland setting, with its exposed bedrock and sparse vegetation, preserves the monuments within a landscape little altered since the Bronze Age.
The site is protected by Cadw, the Welsh Historic Monuments Service, under the reference GM525, recognising its importance as evidence of Bronze Age funerary practice and settlement patterns in Wales. The three cairns together form a significant archaeological record of prehistoric burial customs and territorial organisation on the Welsh uplands.
Three Round Cairns on the Southern Side of Mynydd-y-Glog is a scheduled monument protected by Cadw under reference GM525. View the official record →
Three Round Cairns on the Southern Side of Mynydd-y-Glog is a Bronze Age funerary monument comprising three separate cairns constructed on moorland in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM525.
Three Round Cairns on the Southern Side of Mynydd-y-Glog dates from the prehistoric period, and is classified as a round cairn. It is one of over 32,000 scheduled monuments protected across the UK.
Three Round Cairns on the Southern Side of Mynydd-y-Glog 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 GM525.
Several scheduled monuments lie within 10 km, including Gadlys Ironworks (Remains of Blast Furnace) (5.5 km), Rhondda Fach Cairn (6.9 km), Darren Fawr Round Cairns (7.8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Three Round Cairns on the Southern Side of Mynydd-y-Glog'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.
Three Round Cairns on the Southern Side of Mynydd-y-Glog stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.