Family: Robert de Ferrers, 1st Earl of Derby / Countess of Derby Hawise de Vitré (F14728)
m. Abt 1087
The parent family of Isabel de Ferrers is the Birth Family.
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 | Henry de Ferrers (1036-1099)
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 | Berthe Roberts (1044-1095)
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| Amice de Ferrers (1063-1135) |
| Millicent de Ferrers (1064-1110) |
| William de Ferrers (1066- ) |
| Engenulf de Ferrers (1072-1101) |
| Andrew I, Baron of Vitré (1064-1139)
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| Agnes de Mortaigne (1045-1121)
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| Marquise DeVitre (1100-1162) |
| Robert de Ferrers, 1st Earl of Derby (1062-1139)
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| Countess of Derby Hawise de Vitré (1076-1139)
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| William De Ferrers (1088-1139) |
| Sir Robert de Ferrers, 2nd Earl of Derby (1090-1161)  |
| Walcheline de Ferrers (1092- ) |
| Hawise de Ferrers (1094-1140) |
| Matilda de Ferrers (1096-1161) |
| Agnes Ferrers (1105-1130) |
| Isolde de Ferrers (1118- ) |
| Isoloa De Ferrers (1118- ) |