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18 October 1016Reputable source · 2 sourcesWell documented

Cnut becomes king of England after Assandun

A decisive battle gives Sweyn's son a throne, then an empire spanning three countries

On the timeline · around 18 October 1016 · Kings, Christianity, and the EndGreenland and VinlandKings, Christianity, and the EndCnut becomes king of England after Assandun990 CE100010101020103010401050

Quick facts

Battle
Assandun, 18 October 1016
Defeated
Edmund Ironside
New king
Cnut the Great (r. 1016-1035)
Realms ruled
England, Denmark, Norway

What happened

After Sweyn Forkbeard's death, Cnut fought a two-year war against Aethelred the Unready and then Aethelred's son Edmund Ironside for control of England. Cnut defeated Edmund decisively at the Battle of Assandun on 18 October 1016; Edmund died a few weeks later, and Cnut became king of all England as its second Danish ruler. At the height of his reign in the late 1020s Cnut ruled England, Denmark, and Norway simultaneously, making him one of the most powerful rulers in Europe, and he took an active hand in wider European politics well beyond Scandinavia.

Why it matters

Cnut's reign is the clearest case of a Viking-descended king ruling a settled Christian kingdom as its legitimate monarch rather than as an occupying raider, and his North Sea empire linking England to Scandinavia lasted until his death in 1035. It marks the point at which Viking military success converted fully into conventional medieval kingship.

How we know

The Anglo-Saxon Chronicle records the Assandun battle and Edmund's death shortly after; Cnut's rule over England, Denmark, and Norway simultaneously is documented through his own charters and law codes.

Sources

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Cnut becomes king of England after Assandun · The Vikings · SourcedStory