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With a 900 POD, how do you get a Viking-Breton(or just Breton if you want that) version of the IOTL Norman William the Conqueror taking over England, what would the linguistic and social effect be if Britanny is not part of the kingdom of France(I imagine that would be need for a lasting Viking Britanny, or vice versa as well), would there be some disenfranchisment of the remaining Britons and what would be the relationship with the Welsh?

On top of that, can the name Britain replace England considering the Breton origins?
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