Family: Biorn (Bjorn) ULFIUSSON (ESTRIDSEN), EARL IN DENMARK / Mrs-Biorn ULSIUSSON (F5413)
The parent family of Siward BIORNSSON, Earl of Northumberland is the Birth Family.
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 | Mrs-Biorn ULSIUSSON (980- ) |
| Miss BIORNSSON (1010- ) |
 | Siward BIORNSSON, Earl of Northumberland (1020-1055)  |
| Asmund BJORNSEN (1047-1065) |