This gives some insight into the emergence of England from Wessex. The Danes overran most of the English Kingdoms such as Northumbria, Mercia, East Anglia etc. Alfred and his descendents reconquered the lands from the Danes but instead of making this seem a conquest Alfred made Eolderman Aethelred. Earl of Mercia and married him to his daughter, allowing some idea of regained autonomy. When the kingdoms were absorbed they were not absorbed into Wessex or greater Wessex but into England.