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The Danelaw of England 800-1100 A.D.
From about 800 AD, the waves of Viking assaults on the coastlines of the British Isles were gradually followed by a succession of Viking settlers, bringing with them a culture and a tradition markedly different from that of the existing Anglo-Saxon society. These enclaves rapidly expanded and soon the Viking warriors were establishing areas of control to an extent that they might reasonably be described as kingdoms.
In 878, after Alfred the Great of Anglia defeated the Viking King Guthrum at the Battle of Edington, an area East of the old road from London to Chester was left under the kingship of the Vikings (Danes and Norsemen). Thus, in exchange for peace, the Danelaw -- the teritory still occupied by Vikings -- was agreed upon by the English King.