 As a result, there is some dispute amongst historians concerning the timing and the extent of the influx of Vikings and Strathclyders into Cumbria.Some historians argue that the vacuum left by the Northumbrian eclipse in Cumbria led to people from the kingdom of Strathclyde (also confusingly known at this time as 'Cumbria', the 'land of our fellow countrymen' or 'Cymry') moving into the north of what we now call Cumbria.Other historians doubt this scenario, and see the situation as more of a Celtic 'survival' through the 200 years of Anglian Northumbrian rule, rather than a 'revival' based on "a wholly hypothetical process of later re-colonization" by Strathclyders in the 10th century.