Jorvik

Jorvik was a Viking kingdom, established by the brothers Ivar and Halfdan in York in 866CE (replacing the Saxon kingdom of Deira. Local rule did not survive beyond the brothers -- from Halfdan's death in 877, Jorvik fell under the kings of Bernicia, to the north, and then in 910 more Danes from Dublin took over. There was a brief period (c.927-939CE) when Athelstan of Wessex conquered Jorvik; he was succeeded by Erik Bloodaxe (twice) but on Erik's death (954) the kingdom was regained by and subsumed into England.