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Cof Cymru: National Historic Assets of Wales · Wales

Rhos-Dyrnog Standing Stone

Glantwymyn, Powys, Wales

A scheduled monument in Glantwymyn, Powys, recorded as Standing Stone (Prehistoric).

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Rhos-Dyrnog Standing Stone, Glantwymyn, Powys, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Scheduled monument
Site type
Standing Stone
Period
Prehistoric
Community
Glantwymyn
Unitary authority
Powys
Country
Wales
Coordinates (centre of the scheduled area)
52.59031, -3.73190
SAM number
MG147
Cadw record number
492

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1795 map "To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most humbly inscribed by his obedient humble servant" (Llyfrgell Genedlaethol Cymru – The National Library of Wales).

Historical maps covering this location

  • 1795 · To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most… (Llyfrgell Genedlaethol Cymru – The National Library of Wales)
  • 1830 · V.3:11-15:XV. Britisches Reich. A. Kon: England. b. Frstenthum Wales: Shire: 37-40 (David Rumsey Map Collection, Stanford Libraries)
  • 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 150 Dinas-Mawddwy (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)

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This record in Cadw's own full report ↗

Cadw's description

The monument comprises the remains of a standing stone, which probably dates to the Bronze Age (c. 2300 - 800 BC).

Rhos-Dyrnog standing stone stands to a height of 2.3m and is 1.15x1.00m at the base. It is sited on gently sloping ground, with views to the north, west and south, and was possibly formerly associated with two additional stones.

The monument is of national importance for its potential to enhance our knowledge of prehistoric burial and ritual practices. It is an important relic of a prehistoric funerary and ritual landscape and retains significant archaeological potential. There is a strong probability of the presence of intact burial or ritual deposits, together with environmental and structural evidence. Standing stones are often 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.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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