The Border

The England–Wales border is a legal line and it has been fixed since 1536. That is about all that is simple about it.

For most of the history of this county the border was a belt of country several miles deep in which neither jurisdiction fully applied, both languages were spoken, and the buildings, the farming and the families crossed freely in both directions. Powys holds more of that belt than any other Welsh county.

The dyke

Offa's Dyke is the first attempt to make it a line. Around eighty miles of bank and ditch, mostly with the ditch facing west, conventionally attributed to Offa of Mercia and probably built in several campaigns rather than one.

It is not quite the modern border and never was. It runs east of the line in places and west in others, and there are long gaps where it was either never built or has been ploughed out. What it establishes is the idea that this is a place where a boundary belongs.

The March

After 1066 the Norman kings did something unusual: they let their barons take Wales privately and keep it on their own terms. The Marcher lordships that resulted were effectively small sovereign states. A Marcher lord could build castles without licence, wage war, hold his own courts, and the king's writ did not run in his lands.

That produced two things. First, the extraordinary density of castles in eastern Powys, because every lord had to hold his own ground with his own resources. Second, a legal patchwork so complicated that criminals crossed from one lordship into the next as a matter of routine and became untouchable.

The March also produced the planted borough: a walled or ditched town at a castle gate, settled with English burgesses holding trading privileges that Welshmen did not. Montgomery, Knighton, New Radnor, Builth and Hay all began this way, which is why they were the specific targets of Glyndŵr's forces after 1400.

Abolition

The Laws in Wales Acts of 1535 and 1542 abolished the lordships and drew the line. Powys, or rather the three counties that later became it, is largely composed of former Marcher territory shired into Montgomeryshire, Radnorshire and Brecknockshire.

The line as drawn was arbitrary in places and remains so. Knighton is in Wales and its railway station is in England. Presteigne's bridge is the boundary. Parishes straddled it and some still do. The village of Churchstoke is Welsh with a parish reaching into Shropshire.

What the border looks like on the ground

Timber framing. The black-and-white building tradition of Herefordshire and Shropshire does not stop at the line. It continues several miles into Wales and then fades. Berriew and Montgomery have it; Rhayader does not.

Church dedications. Anglo-Saxon and Norman saints east of the line, Welsh saints west of it, with a broad overlap where both appear in the same valley.

Place names. The most reliable indicator, and the one that changes most slowly. Radnorshire lost the Welsh language almost entirely but kept almost all of its Welsh place names, which means the map preserves a linguistic geography that the population no longer reflects.

Field boundaries. Larger and more regular on the English side, smaller and more irregular on the Welsh, because the enclosure history and the inheritance customs differed.

Still moving

The border stopped moving legally in 1536 and has kept moving in every other sense.

The language line has run westward more or less continuously for four centuries and is now some distance inside Wales in most of Powys. Meanwhile the economic border runs the other way: Powys shops in Shrewsbury and Hereford, its hospitals are frequently in England, and a substantial proportion of people in the eastern part of the county work over the line.

Devolution has re-sharpened it. Since 1999 the border has been a real administrative boundary again — different health, education and planning systems on either side of a bridge in Presteigne — for the first time since the March was abolished.

Where to see it

Offa's Dyke north of Knighton, the best-preserved stretch anywhere.

The grid of Montgomery, laid out from 1223 as a planted town.

The bridge at Presteigne, where the county boundary is the water.

Any of the border churches at Old Radnor, Kerry or Llanymynech, where the architecture and the dedications belong to two traditions at once.