as its enemies often referred to it, invaded Northumbrian territory in 866 AD. The Danes conquered and assumed what is now York and renamed it Jórvík, making it the capital city of a new Danish kingdom under the same name. The area which this kingdom covered included most of Southern Northumbria, roughly equivalent to the borders of Yorkshire extending further West.

The Danes went on to conquer an even larger area of England that afterwards became known as the Danelaw;