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

Siward Biornsson Earl of was born in 0997 in Denmark.  Siward Biornsson Earl of's father was Biorn Ulfsson Earl in England.  His paternal grandparents were Ulf Thorgilsson Jarl of Denmark and Estrid Svendsdatter Princess Of Denmark.  He was an only child.  He died at the age of 58 in 1055 in York, Yorkshire, England.

Siward Biornsson Earl of's family with Aefflaed of Bernicia

‌Siward Biornsson Earl of and Aefflaed of were married in a religious ceremony about 1038 in Northumbria, England.  They had a son and a daughter, named Waltheof II Earl of and Aelflaed Sybilla FitzSiward of.

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