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The summit of Mynydd Carn-y-cefn one mile west of Blaina looking west
Nant Ystruth, Cwm-celyn, Blaina
St Peter's, Blaina, 1820. steel engraving from a drawing by Henry Gastineau

Aberystruth is an ancient parish in the north-west corner of Monmouthshire against the border with Brecknockshire. It forms the westernmost part of the Abergavenny Hundred and lies between the Monmouthshire parishes of Bedwellty to the west and Trevethin to the east. It extends from Beaufort in the north beyond Abertillery in the south.[1]

It has a population of 27,386 in the following towns and villages:

The parish church located near the centre of the parish in the village of Blaina and dedicated to St Peter, was first built about the year 1500 and that building lasted more than 320 years.[2][3]

Development of Aberystruth's coal and iron ore deposits in the early nineteenth century brought explosive growth to Abertillery and Nantyglo and its new suburb of Brynmawr.

The 19th century settlement of Brynmawr spans the boundary of the parishes of Aberystruth (Monmouthshire) and Llanelly and Llangattock (Brecknockshire). At the southern end of Boundary Street in Brynmawr you may still find the Boundary Stone marking the point where the three parishes meet.[4]


  1. Monmouthshire parish map
  2. Rev. Edmund Jones. A Geographical, Historical, and Religious Account of the parish of Aberystruth in the county of Monmouth. printed by The Family at Trevecka 1779
  3. A history of St Peter's church Blaina
  4. Brynmawr Heritage Trail, Blaenau Gwent County Borough Council

Outside links