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Male Earl Siward Biornsson of Northumbria Click to view Earl Siward Biornsson of Northumbria in the family tree

Siward was born about 0995 in Denmark.  Siward's father was Biorn Ulfiusson.  His paternal grandparents were Earl Ulf Thorgilsson and Princess Estrid Margarete Svendsdatter of Denmark.  He was an only child.  He died in 1055 in York, Yorkshire, England.  He was buried in Galmanho Abby, York, Yorkshire, England.


Siward's family with Aelfled of Bernicia

‌Siward and Aelfled were married in a religious ceremony about 1033 in Northumberland, England.  They had a son and a daughter, named Waltheof and Sibyl.

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