Family: Biorn ULSIUSSON, Earl In Denmark (F936)
The parent family of Siward BIORNSSON, Earl of Northumberland is the Birth Family.
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 | Ulsius (950- ) |
| Biorn ULSIUSSON, Earl In Denmark (975- )
|
 | (Daughter) BIORNSSON (1010- ) |
| Siward BIORNSSON, Earl of Northumberland (1020-1055)  |