Siward BJORNSSON 
Siward was born about 1012 in Denmark. Siward's father was Bjorn ULFIUSSON. He was an only child. He died in 1055 in York, East Riding Yorkshire, England.
They had a son named Waltheof II Siwardson Earl of.
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Children
Waltheof II Siwardson Earl of NORTHUMBERLAND
Waltheof II Siwardson Earl of was born in 1046 in Northumberland, England. He died at the age of 30 on May 31st, 1076 in beneaded in Winchester, Hampshire, England.