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alternatehistory.com
Deva Victrix is the Roman name of my home town, Chester
Some interesting ideas about the city have come up with the idea that Deva could have been the planned capital of Roman Britain, with the possibly of a conquest of Ireland. I know that Wiki is not the best of sources, but it does a quite good job in this case of giving a bit of background.
So, that challenge is to have Deva as the Capital of Roman Britain and bonus points if you explain how this would have affected the course of British History.