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Female Sibyl De Ferrers Click to view Sibyl De Ferrers in the family tree

Sibyl's father was Earl of Derby William V De Ferrers Earl of Derby and her mother was Sibyl Marshall.  Her paternal grandparents were Earl of Derby William IV De Ferrers Earl of Derby and Agnes De Meschines; her maternal grandparents were 1st Earl of Pembroke William Marshall 1st Earl of Pembroke and Isabel Fitzgilbert De Clare. She had five sisters named Eleanor, Isabel, Joan, Maud and Agnes. She had two half-brothers and two half-sisters, named Robert, William, Joan and Agnes.

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