After the conquest of England by the Danish king Cnut in 1016, he established earldoms based on the former kingdoms of Northumbria, Mercia and East Anglia, but initially administered Wessex personally. Within a few years, however, he had created an earldom of Wessex, encompassing all of England south of the Thames, for his English henchman Godwin. For almost fifty years the vastly wealthy holders of this earldom, first Godwin and then his son Harold, were the most powerful men in English politics after the king. Finally, on the death of Edward the Confessor in 1066, Harold became king, reuniting the earldom of Wessex with the crown. No new earl was appointed before the ensuing Norman Conquest of England, and as the Norman kings soon did away with the great earldoms of the late Anglo-Saxon period, 1066 marks the extinction of Wessex as a political unit.