Historic Counties Institute

Geography • Identity • Continuity

Reference, evidence, and public education for the historic counties.

Historic counties are the enduring geography. Councils are administration, lieutenancies are ceremonial – neither define the counties.

County Dossier

Brecknockshire

A county of mountains, lakes and medieval roots.

Brecknockshire, or Breconshire, is an inland county in mid-Wales. Its northern border follows the River Wye (Afon Gwy), along which lie the market town of Builth Wells (Llanfair-ym-Muallt) and the book town of Hay on Wye (Y Gelli Gandryll).

Brecknockshire county reference map

At a glance

Brecknockshire at a glance

A county of mountains, lakes and medieval roots.

Nation Wales
Formal name County of Brecknock
Local name Sir Frycheiniog
Foundation 1535
  • Kingdom of Brycheiniog
  • Formed from the ancient Welsh cantrefs of Brycheiniog, Builth and Hay
  • Brecknock or Breconshire
  • Area: 742 sq miles / 1,922 km²
  • Population: 67,598
  • County top: Pen y Fan 2,906 ft / 886 m

County Geography

Brecknockshire meets Radnorshire to the north, Herefordshire to the east, Monmouthshire and Glamorgan to the south and south-east, Carmarthenshire to the west, and Cardiganshire to the north-west. The county is shaped by the northern Wye line, the Usk valley through the centre, the plateau of Mynydd Epynt, and the Beacons and Black Mountains on the southern and eastern sides.

Brecknockshire is easy to recognise because valley core and mountain rim work together: the Usk and Wye lead the eye, while the uplands hold the county’s edge.

Map Reference

View Brecknockshire on the map

Brecknockshire is the county. The map also shows lieutenancies and council areas that use the county name.

Open Brecknockshire in the Interactive Map

Places and routes

Brecon, Builth Wells, Hay-on-Wye, Crickhowell, and Llanwrtyd Wells show the county from central Usk valley and northern Wye line to the eastern gateway and the western Irfon side.

Connections

Routes through Brecknockshire have long followed the Usk and Wye, crossed the passes through the Beacons, and linked the north-country with the western upland side. Movement follows the same valley-and-mountain structure as the county itself.

Brecknockshire landscape or key location
Waterfall in Brecon Beacons National Park, Sir Frycheiniog.

Names

  • Brecknockshire
  • County of Brecknock
  • Breconshire
  • County of Brecon
  • Sir Frycheiniog

Sir Frycheiniog is the Welsh form of Brecknockshire. County of Brecknock is the formal historical style, Breconshire is the familiar alternative, and County of Brecon preserves the shorter formal variant.

The county grew from the older kingdom of Brycheiniog and took formal county shape in 1536. Brecknockshire remains clear because that older territorial identity still sits visibly within its landscape.

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County Reference

Explore Brecknockshire

Open the map to explore Brecknockshire, or return to the county index to browse other counties.