alternatehistory.com

So I'll preface everything I saw here with the admission that I am extremely ignorant when it comes to the history of the British isles.

Anyway, I'm wondering what is the latest plausible POD for the Welsh repelling the advances of the English and expanding themselves into Western England (Gloucester, Shrewsbury, Chester etc) and how far could they go? Extreme bonus points for Welshification of the areas under Welsh control.
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