Family: Sir Robert de Ferrers, 2nd Earl of Derby / Margaret Peverel (F14717)
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 Robert de Ferrers, 2nd Earl of Derby (1090-1161)
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| William de Ferrers, 3rd Earl of Derby (1136-1189)  |