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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