After the withdrawal of the Roman legions from Britain in 410 AD, new smaller political entities took the place of the centralised structure.
King Peibio and his descendants were rulers of the area attested from about 555 AD until, in the middle of the 7th century, Onbraust of Ergyng married Meurig of Gwent and the two neighbouring kingdoms were combined.
Saint Dubricius (known in Welsh as Dyfrig), a prince and bishop, was important in the sub-Roman establishment of the Christian church in the area.
During the rest of the century they moved its frontier southward to the banks of the Dore, the Worm Brook and a stream then known as the Taratur, annexing northern Ergyng.
The sites of old British churches fell to Mercia, and the Britons became regarded as foreigners – or, in the Old English language, "Welsh" – in what had been their own land.
[6]In the 870s Viking raids continued in the area, while Wessex was ruled by Alfred the Great and Mercia by Ceolwulf II.
He sees the payment of a ransom by the West Saxon king as evidence that the far south-east of Wales then lay in the sphere of power of Wessex rather than Mercia.
It also stated the Welsh of Archenfield were allowed to retain their old rights and privileges in return for forming an advance and rear guard when the King's army entered or left Wales.
The exemption from services was mentioned again in 1250 and 1326, when it was stated: "The Frenchmen and Welshmen of Urchenesfeld hold their tenements in chief of our lord the King by socage, rendering 19 pounds 7 shillings and 6 pence.
"[4] The Welsh inhabitants of Archenfield thereafter retained their privileged position, living in a shadowy border land that was not really part of England nor Wales.
However, no consideration was given at the time to ethnic or linguistic realities, and so various territories were grouped together in a rough and ready manner to form the new shires.
Archenfield remained a predominantly Welsh-speaking region until at least the 17th century, and the language was still spoken to a significant extent in the Kentchurch area as late as 1750.