Ancient Monuments

History on the Ground

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Chambered Cairn above Afon y Dolau Gwynion, north east of Lake Vyrnwy

A Scheduled Monument in Llanwddyn, Powys

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Latitude: 52.7957 / 52°47'44"N

Longitude: -3.4556 / 3°27'20"W

OS Eastings: 301949

OS Northings: 323008

OS Grid: SJ019230

Mapcode National: GBR 6L.WT8M

Mapcode Global: WH67M.WZNM

Entry Name: Chambered Cairn above Afon y Dolau Gwynion, NE of Lake Vyrnwy

Scheduled Date: 21 August 1995

Source: Cadw

Source ID: 1419

Cadw Legacy ID: MG227

Schedule Class: Religious, Ritual and Funerary

Category: Chambered round cairn

Period: Prehistoric

County: Powys

Community: Llanwddyn

Traditional County: Montgomeryshire


The monument consists of the remains of a chambered round cairn, a Neolithic or Bronze Age (c 4,200BC - 800BC) burial monument comprising a stone-built chamber within a circular or sub-circular stone built mound.

The cairn is erected on a natural shelf below the crest of a ridge, looking southwards along the valley toward the Vyrnwy. The circular mound is 1.5m in height and 11m in diameter, in the dished centre of which are the remains of a stone tomb. The chamber is 2.5m in length along its north-south axis and 0.5m wide; it is formed of large slabs set on edge with a deliberate construction at the east end and a narrow portal. An almost circular, stony bank surrounds the chamber with a diameter of c. 10.6m, east-west and 8.6m north-south.

The monument is of national importance for its potential to enhance our knowledge of prehistoric burial and ritual practices. The features are an important relic of a prehistoric funerary and ritual landscape and retain significant archaeological potential. There is a strong probability of the presence of both intact ritual and burial deposits, together with environmental and structural evidence. Chambered round barrows may be part of a larger cluster of monuments and their importance can further enhanced by their group value.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Source: Cadw

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