Carreg Maen Taro is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 9 February 1995. Terraced dwellings.
Carreg Maen Taro
- WRENN ID
- final-ember-moss
- Grade
- II
- Local Planning Authority
- Brecon Beacons National Park
- Constituency
- Torfaen MP: Nick Thomas-Symonds (Lab)
- Country
- Wales
- Date first listed
- 9 February 1995
- Type
- Terraced dwellings
- Address
- Carreg Maen Taro, Garn-Yr-Erw, Blaenavon, Torfaen
- OS grid reference
- SO 238 113
- Coordinates
- 51.79533, -3.1059
- Source
- Cadw listing
Description
Carreg Maen Taro is a roughly hewn standing stone that stands 1.7 meters high. It is marked with the letters 'B' and 'M' and is surrounded by a spread of smaller stones. This stone is traditionally believed to mark the site of an ancient battle, although its exact date of erection is uncertain. It is located on the former boundary line between the counties of Brecknockshire and Monmouthshire, which the letters refer to. The 'M' is carved on the south-east side, while the 'B' is on the north side. The letters are in a primitive serifed Roman style, indicating they were likely carved in the 18th or early 19th century. Additionally, the stone marks a geological fault known by the name, which can be translated as "stone of rock striking," suggesting that the standing stone indicates where surface rock meets the fault.
Local climate
Carreg Maen Taro sits in a wetter-than-average part of the UK, with an average of 1,040 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 75% of listed buildings.
It experiences an average of 48 freeze-thaw cycles a year, more than 89% of listed buildings. Of these, 24 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.
Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.
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- No EPC on record for this property
- No sale records on file
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- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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