There were renewed Scandinavian attacks on England at the end of the 10th century. Two powerful Danish kings (Harold Bluetooth and later his son Sweyn) both launched devastating invasions of England. Anglo-Saxon forces were resoundingly defeated at Maldon in 991. More Danish attacks followed, and their victories were frequent. Æthelred's control over his nobles began to falter, and he grew increasingly desperate. His solution was to pay off the Danes: for almost 20 years he paid increasingly large sums to the Danish nobles to keep them from English coasts. These payments, known as Danegelds, crippled the English economy.

Æthelred then made an alliance with Normandy in 1001 through marriage to the Duke's daughter Emma, in the hope of strengthening England. Then he made a great error: in 1002 he ordered the massacre of all the Danes in England. In response, Sweyn began a decade of devastating attacks on England. Northern England, with its sizable Danish population, sided with Sweyn. By 1013, London, Oxford, and Winchester had fallen to the Danes. Æthelred fled to Normandy and Sweyn seized the throne. Sweyn suddenly died in 1014, and Æthelred returned to England, confronted by Sweyn's successor, Cnut. However, in 1016, Æthelred also suddenly died. Cnut swiftly defeated the remaining Saxons, killing Æthelred's son Edmund in the process. Cnut seized the throne, crowning himself King of England.

Cnut was succeeded by his sons, but in 1042 the native dynasty was restored with the accession of Edward the Confessor. Edward's failure to produce an heir caused a furious conflict over the succession on his death in 1066. His struggles for power against Godwin, Earl of Wessex, the claims of Cnut's Scandinavian successors, and the ambitions of the Normans whom Edward introduced to English politics to bolster his own position caused each to vie for control of Edward's reign.