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Gonna push it back to the 850s and the invasion that was repelled IOTL by Aethelwulf of Wessex. (851)
In OTL, Ivar decided to test the strength of Wessex, to the west of East Anglia. In ATL, however, Ivar decides to seize Northumbria after the failure of the local puppet ruler, Ecgberht, to pay the proper amount of Danesgeld.