Harold Godwinson became king, probably appointed by Edward on his deathbed and endorsed by the Witan. But William of Normandy, Harald Hardråde (aided by Harold Godwin's estranged brother Tostig) and Sweyn II of Denmark all asserted claims to the throne. By far the strongest hereditary claim was that of Edgar the Ætheling, but due to his youth and apparent lack of powerful supporters, he did not play a major part in the struggles of 1066, although he was made king for a short time by the Witan after the death of Harold Godwinson.

In September 1066, Harald III of Norway and Earl Tostig landed in Northern England with a force of around 15,000 men and 300 longships. Harold Godwinson defeated the invaders and killed Harald III of Norway and Tostig at the Battle of Stamford Bridge.

On 28 September 1066, William of Normandy invaded England in a campaign called the Norman Conquest. After marching from Yorkshire, Harold's exhausted army was defeated and Harold was killed at the Battle of Hastings on 14 October. Further opposition to William in support of Edgar the Ætheling soon collapsed, and William was crowned king on Christmas Day 1066. For five years, he faced a series of rebellions in various parts of England and a half-hearted Danish invasion, but he subdued them and established an enduring regime.