Family: {Earl} Siward (de) Northumbria / Elfleda (de) Northumbria (F13550)
The parent family of Sybil De Munsö is the Birth Family.
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 | Biorn Styrbiornson (953- )
|
 | Mrs- Biorn Styrbiornson (958- ) |
| Earl Seward Bjornsson, of Northumbria (980-1055)  |
| {Earl} Siward (de) Northumbria (990-1055)
|
| Sybil De Munsö (1010-1040) |
| Walthe of Northumberland (1045-1076) |