Ancient Monuments

History on the Ground

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Gwaun Ymryson Round Cairn

A Scheduled Monument in Merthyr Cynog, Powys

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Latitude: 52.0603 / 52°3'37"N

Longitude: -3.4131 / 3°24'46"W

OS Eastings: 303219

OS Northings: 241160

OS Grid: SO032411

Mapcode National: GBR YN.D820

Mapcode Global: VH6BC.SGJW

Entry Name: Gwaun Ymryson Round Cairn

Scheduled Date: 22 March 1994

Source: Cadw

Source ID: 1814

Cadw Legacy ID: BR205

Schedule Class: Religious, Ritual and Funerary

Category: Cairn

Period: Prehistoric

County: Powys

Community: Merthyr Cynog

Traditional County: Brecknockshire


The monument comprises the remains of two round cairns, which probably date to the Bronze Age (c. 2300 - 800 BC) and are situated to the east of a long ridge which runs north to south 411m above sea level on enclosed moorland. The southern cairn has a diameter of 9.5m on its east west axis and 8.7m on its north south axis and stands up to 0.6m in height. The second cairn is approximately 120m to the north of the first and has a diameter of 4m but of negligible height, though noticeably stony in composition.

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. Cairns 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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