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Danelaw

The Danelaw (from the Old English Dena lagu) was an area of England under the administrative control of the Vikings (or Danes, or Norsemen) from the late 9th century.

It was roughly the area to the north of a line drawn between between London and the river Mersey. It was established as a result of the Treaty of Wedmore in the late 9th century, after Alfred the Great had defeated the Viking Guthrum at the Battle of Edington. The Danelaw represented a consolidation of power for Alfred; the subsequent conversion of Guthrum to Christianity underlines the ideological significance of this shift in the balance of power.

Five fortified towns became particularly important in the Danelaw: Leicester, Lincoln, Nottingham, Stamford and Derby. These strongholds became known as the "Five Boroughs". "Borough" derives from the Old English word "burg", meaning a fortified town.

The Danelaw was gradually eroded by Saxon raids in later years, but the influence of this period of Scandinavian settlement can still be seen in the North of England and the East Midlands, most evidently in place names: name endings such as "by" or "thorp" being particular giveaways.

The distinctive laws applied in the area caused the incorporation of several words into the English language which were derived from Danelaw, including the word law itself.

See also: List of generic forms in British place names