Siward, earl of Northumbria
- William M. Aird
Siward, earl of Northumbria (d. 1055), magnate, first appears witnessing as dux in a charter by King Cnut for Archbishop Ælfric of York in 1033. Siward's name (Sigvarthr) suggests that he was of Danish stock, although the names of his parents are unknown. The life of ...