Much of Northumbria was also shired, the best known of these counties being Hallamshire and Cravenshire. The Normans did not use these divisions, and so they are not generally regarded as ancient counties. The huge county of Yorkshire was a successor to the Viking Kingdom of York, and at the time of the Domesday Book in 1086 it was considered to include what was to become northern Lancashire, as well as parts of Cumberland, and Westmorland. Most of the later Cumberland and Westmorland were under Scottish rule until 1092. After the Norman Conquest in 1066 and the harrying of the North, much of the North of England was left depopulated and was included in the returns for Cheshire and Yorkshire in the Domesday Book. However, there is some disagreement about the status of some of this land. The area in between the River Ribble and the River Mersey, referred to as in the Domesday Book, was included in the returns for Cheshire. Whether this meant that this land was actually part of Cheshire is however not clear. The Northeast land that later became County Durham and Northumberland, was left unrecorded.