The Kingdom of the Britons

What would be the latest possible POD which the Welsh would have control of the most of the British Ilse instead of the English. And would the English be forced off the island, or would they become something similar to Wales, and lastly could the Welsh have built nation comparable to England in power and influence?
 
What would be the latest possible POD which the Welsh would have control of the most of the British Ilse instead of the English. And would the English be forced off the island, or would they become something similar to Wales, and lastly could the Welsh have built nation comparable to England in power and influence?
The Britons were badly hit by plague in the mid sixth century whilst the English were not until later. Reduce the impact on the Britons and they can hold out longer. It would also help if English colonists stopped coming over from Germany.

Revitalised Britons could then push back into the Midlands leaving English enclaves on the North Sea and England coast coasts. there would probably be holdable even if they found it necessary to submit to Briton overlordship and did not get wiped out by the Vikings.

Jumping ahead, for the Britons to match OTL England, they need London and that city was under English control by 510. The reason for control of London is that it is the centre of flows of resources. Thames shipping is only part of this. In the Middle Ages grain was transported from Norwich and Southampton, clear demonstrations of London's economic importance. No other city is quite so well located as to be able to match it.

If you do not centralise the economic power of the Midlands and the south coast you can not match England as it came to be on OTL. Thus the Britons need both the Thames Valley and a port at the end of it.
 
Also you need the British/Welsh to adopt primogeniture rather than inheritance by partition, so that their larger kingdoms don't so easily get fragmented.
 
Since the Tudors did have some Welsh ancestry, you could make Henry VII into a Welsh-language supporter, who embarks on a 118-years-long forced linguistic cambricisation of Lloegr (England), until the Stuarts take over.

If this is done in an efficient and successful way, it might have reversed the retreat of the Welsh and Cornish languages.
 
Since the Tudors did have some Welsh ancestry, you could make Henry VII into a Welsh-language supporter, who embarks on a 118-years-long forced linguistic cambricisation of Lloegr (England), until the Stuarts take over.

If this is done in an efficient and successful way, it might have reversed the retreat of the Welsh and Cornish languages.

And how in blazes is he going to do that? I don't see anyone in England not, at best, ignoring it.
 
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