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WI the Scandinavians never get into raiding westwards in a big way?
Say they somehow unite earlier into a bunch of kingdoms and start fighting each other.
Or they decide Russia looks like a rather nice place.
Whatever, Scandinavia isn't the issue. Lets have a ASB plague if it takes that.
In particular here I'm thinking of Britain...A undisturbed continuation of the anglo-saxon kingdoms. But of course Normandy would also be a huge deal...