Y Pigwn (Trecastle Mountain)

View from south west.

A single stone row measuring 33m long, including five small stones leading from a stone circle. Originally the row may have extended further to a nearby cairn. The row is situated on a gentle north east facing slope, is orientated ENE to WSW and stands close to two stone circles and cairns.


Wales     Powys     Brecon Beacons     SN 83273 31053     Lat 51.965663   Long -3.7004258

Map showing the location of Y Pigwn (Trecastle Mountain) stone row.

Simplified plan of the Y Pigwyn stone alignment and circles. (Source: Burl, A., 1976, 261 and fieldwork).

Map showing the possible original extent of the Y Pigwyn stone alignment


Type: Single Length: 33m
No. of stones: 5 Size of stones: Only small
Orientation: 60° Altitude: 388m
Upper end: – Lower end: Stone circle
Straight (Yes or No)  : Sea View: No
Context:  Stone circle and cairn

Other Information

Public Access:  Yes
Land Status: National Park
Scheduled Ancient Monument: BR069


Category: Plausible. It has been suggested this could be the remains of a field boundary. Historic field boundaries in the vicinity consist of banks and ditches and are not formed by stones.  This line of stones leads from a stone circle towards a cairn. The existing evidence strongly supports a prehistoric interpretation.


This stone row is of Type S7. Information on this form of stone row and other rows of this type is available here.


Row of small stones leading towards the smaller of the two stone circles. View from west (Scale 1m). 

Looking south west along the row (Scale 1m). This row is aligned on a cairn 172m from the eastern end of the row. Deep peat and small stones means that it is possible that this row once extended as far as the cairn.

The three western stones in the row. View from north east (Scale 1m).

Looking along the row from the south west (Scale 1m). Whilst much shorter, this row is very similar in character to the row at Bancbryn.

Row approaching the small stone circle. View from the south west (Scale 1m).

Small stone circle. The stone at the bottom right forms part of the stone row. View from north.

Stone circle and the final stone in the row. View from west (Scale 1m).

The five visible stones.

The large stone circle and cairn. View from north west.

The stone row may extend as far as the cairn at SN 83140 30992. Deep peat deposits may have accumulated over the small stones. If this is the case the row would be 172m long and lead between a cairn and a stone circle.

Access Information

Car parking is available at SN 84525 30024. From its a bit of a hike along the track leading west. After about 1.5km head north across open moorland to the row and stone circles. Don’t forget to visit the cairn at SN 83140 30992.

Online Resources 

Megalithic Portal     Modern Antiquarian     Coflein     Archwilio     Heritage Journal

Other References

Burl, A., 1976, The Stone Circles of The British Isles, Yale University Press, New Haven and London, pg. 261.

Burl, A., 1993, From Carnac to Callanish – The prehistoric rows and avenues of Britain, Ireland and Brittany, Yale University Press, New York and London, pg. 225.


VISITED:- 5th July 2014

FIRST PUBLISHED:- 27th January 2016

LAST UPDATED:- 18th March 2019

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