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Family William I de Ferrers , 3rd Earl of Derby & Sybil de Braose Click to view William I de Ferrers , 3rd Earl of Derby & Sybil de Braose in the family tree

William I de and Sybil de were married in a religious ceremony about 1167 in Sussex, England.  They had a son and three daughters, named William II de, Agatha de, Millicent de and Pernell (Petronella) de.

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