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In page Northumbria:

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In the early twentieth century, historians identified Eric of York with the Norwegian king Eric Bloodaxe, although more recent scholarship has challenged this association.[citation needed] He held two short terms as King of Northumbria, from 947 to 948 and 952 to 954.[a] Historical documentation on his reign is scarce, but it seems Eric pushed out the joint English-Viking rulers of Northumbria in 947,[1] who then regained the land in 948 or 949. Eric took back the throne in 952, only to be deposed again in 954.[2] Eric was the last Viking king of Northumbria, and his authority only extended to the southern kingdom of York. In 954, he was murdered, allegedly with the connivance of Oswulf, the Anglo-Saxon ruler of the northern Northumbrian territory of Bamburgh.[3]