Family: Sir Robert de Ferrers, 2nd Earl of Derby / Countess of Derby Margaret de Peverel (F14718)
m. Abt 1135
The parent family of William de Ferrers, 3rd Earl of Derby is the Birth Family.
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 | Robert de Ferrers, 1st Earl of Derby (1062-1139)
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| Sir William Peverel,, II (1080-1147)
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 | Avicia de Lancaster (1085-1150)
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| Ellen Or Helen Peverel (1109- ) |
| Helen Peverel (1109- ) |
| Countess Of Derby Margaret Peverel (1114-1154)  |
| Margaret de Peverel (1114-1148) |
| Sir Richard Peverell, of Ermynton (1120-1180) |
| Margaret Peverell (1144-1157) |
| Atheline Peverel (1159- ) |
| Sir Robert de Ferrers, 2nd Earl of Derby (1090-1161)
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| Countess of Derby Margaret de Peverel (1099-1161)
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| William de Ferrers, 3rd Earl of Derby (1136-1189) |
| Robert de Ferrers (1140-1189) |
| Petronel de Ferrers (1152- ) |