Family: Osbern I De Bolbec / Avelina (Wevia) De Crepon (F30843)
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 | Gunnor De Crepon (935-1031)  |
 | Herfast (Arfastus) De Crepon (955- ) |
| Osbern I De Bolbec (945-1035) |
| Avelina (Wevia) De Crepon (960- )
|
| Walter I Giffard, Lord Of Longueville (1010-1102) |
| Osbern II De Bolbec (990-1063) |
| Miss Giffard (1057-1085) |
| Vicomte Godfrey D'arques (1010- ) |