Northumbria (; ; ) was an early medieval Anglo-Saxon kingdom in what is now Northern England and south-east Scotland. The name derives from the Old English meaning "the people or province north of the Humber", as opposed to the people south of the Humber Estuary. Northumbria started to consolidate into one kingdom in the early seventh century, when the two earlier core territories of Deira and Bernicia entered into a dynastic union. At its height, the kingdom extended from the Humber, Peak District and the River Mersey on the south to the Firth of Forth (now in Scotland) on the north. Northumbria ceased to be an independent kingdom in the mid-tenth century when Deira was conquered by the Danes and formed into the Kingdom of York. The rump Earldom of Bamburgh maintained control of Bernicia for a period of time; however, the area north of the Tweed was eventually absorbed into the medieval Kingdom of Scotland while the portion south of the Tweed was absorbed into the Kingdom of England and formed into the county of Northumberland and County Palatine of Durham. Kingdom (654–954) Communities and divisions Possible Celtic British origins The Anglo-Saxon kingdom of Northumbria was originally two kingdoms divided approximately around the River Tees: Bernicia was to the north of the river and Deira to the south. It is possible that both regions originated as native Celtic British kingdoms, which the Germanic settlers later conquered, although there is very little information about the infrastructure and culture of the British kingdoms themselves. Much of the evidence for them comes from regional names that are British rather than Anglo-Saxon in origin. The names Deira and Bernicia are likely British in origin, for example, indicating that some British place names retained currency after the Anglo-Saxon migrations to Northumbria. There is also some archeological evidence to support British origins for the polities of Bernicia and Deira. In what would have been southern Bernicia, in the Cheviot Hills, a hill fort at Yeavering called Yeavering Bell contains evidence that it was an important centre for first the British and later the Anglo-Saxons. The fort is originally pre-Roman, dating back to the Iron Age at around the first century. In addition to signs of Roman occupation, the site contains evidence of timber buildings that pre-date Germanic settlement in the area that are probably signs of British settlement. Moreover, Brian Hope-Taylor has traced the origins