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Male Siward Biornsson Click to view Siward Biornsson in the family tree

Siward was born about 1020 in Of, , , denmark.  Siward's father was Biorn Bjorn Ulfiusson Estridsen and his mother was Ulsiusson.  His paternal grandparents were Ulf Thorgilsson and Estrid (Margarete) Svendsdatter Princess of denmark. He had a half-brother named Siward.  He died in 1055 in , York, Yorkshire, England.  He was buried in Galmanho Abby, York, Yorkshire, England.


Siward's family with Aelfled (Elfleda) Of Bernicia

‌Siward and Aelfled (Elfleda) Of were married in a religious ceremony about 1033 in Of, , Northumberland, England.  They had a son named Waltheof Earl Of.

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