Alianore de Ferrers Peerage person ID=42698 Parents William de Ferrers, 5th Earl of Derby Sibyl Marshal Children Siblings Joan de Ferrers Elizabeth Ferrers Robert de Ferrers, 6th Earl of Derby Isabel Ferrers Agatha Ferrers Sibyl de Ferrers William Ferrers Agnes de Ferrers Maud Ferrers Joan de Ferrers Agnes Ferrers Partners Roger de Leyburne Roger de Quincy, 2nd Earl of Winchester William de Vaux