Siward syo͞o´ərd [key], d. 1055, earl of Northumbria. A Danish warrior, he probably came to England with King Canute. At the behest of King Harthacanute in 1041 he ravaged Worcestershire and perhaps murdered Eadwulf of Northumbria; thereafter he was himself earl of Northumbria. He supported Edward the Confessor against Earl Godwin in 1051 and in 1054 defeated Macbeth , king of Scotland, on behalf of Siward's nephew, later Malcolm III.
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