Northumbria survives Timelines?

Are there any timelines where Northumbria manages to defeat or deflect the Viking invasion, and it is Northumbria not Wessex that unifies the heptarchy and forms England?

Or even ones where Northumbria manages to survive as an independant entity until at least the 14-1500s?
 
I am potentially writing one at the moment, check out Saints and Sunrises. its early days but already Northumbria has had different fortunes and its oath will only diverge from our timeline as it goes on
 
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