The Kingdom of Wessex was now in its ascendant and established its dominance over the North in general, placing Yorkshire again within Northumbria, which retained a certain amount of autonomy as an almost-independent earldom rather than a separate kingdom.The Wessex Kings of England were reputed to have respected the Norse customs in Yorkshire and left law-making in the hands of the local aristocracy.
Queen Cartimandua left her husband Venutius for his armour bearer, Vellocatus, setting off a chain of events which changed control of the Yorkshire area.Cartimandua, due to her good relationship with the Romans, was able to keep control of the kingdom; however her former husband staged rebellions against her and her Roman allies.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.Elmet remained independent from the Germanic Northumbrian Angles until some time in the early 7th century, when King Edwin of Northumbria expelled its last king, Certic, and annexed the region.
At its greatest extent, Northumbria stretched from the Irish Sea to the North Sea and from Edinburgh down to Hallamshire in South Yorkshire.
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; but whereas most of the Danelaw was still English land, albeit in submission to Viking overlords, it was in the Kingdom of Jórvík that the only truly Viking territory on mainland Britain was ever established.
Due to its great size in comparison to other English counties, functions have been undertaken over time by its subdivisions, which have also been subject to periodic reform.
Throughout these changes, Yorkshire has continued to be recognised as a geographical territory and cultural region.
The Kingdom prospered, taking advantage of the vast trading network of the Viking nations, and established commercial ties with the British Isles, North-West Europe, the Mediterranean and the Middle East.