Viking raiders defeat Alfred

How would the British Isles (and Europe in general) had the Vikings defeated Alfred the Great, conquering the last Anglo-Saxon kingdom in the southeast of England? All the others had already fallen, and IOTL Anglo-Saxon society re-emerged from Wessex, Alfred's last unconquered state.
 
I wonder if the bigger problem with this isn't that you destroy Christianity, but you destroy England. There's no centralized Saxon state to reconquer the land in the 9th century, just bands of warring Norse.
 
I wonder if the bigger problem with this isn't that you destroy Christianity, but you destroy England. There's no centralized Saxon state to reconquer the land in the 9th century, just bands of warring Norse.

Weren't the Norse actually starting to settle down, though? Danish and Norse-Gaelic nobles were actually starting to settle Northumbria, although this process was curtailed by the reconquest, and if Wessex is conquered, this process presumably goes on. England is rich and fertile enough that wealth doesn't depend on having to raid. Presumably the Norse nobles who manage to set up shop will then have a vested interest in establishing a state of their own.
 
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