The Battle of Ellandun (also spelled Ellendun) was fought in 825 between the armies of Egbert of Wessex and Beornwulf of Mercia. Although costly to both sides, King Egbert won. The battle effectively brought an end to Mercian in southern England. It gave Wessex over the remaining Anglo-Saxon kingdoms in the south. A century later the kingdom of Wessex became the kingdom of England.