Maud Ferrers Peerage person ID=42577 Parents William de Ferrers, 5th Earl of Derby Sibyl Marshal Children Cicely de Vivonne Siblings Joan de Ferrers Alianore de Ferrers Elizabeth Ferrers Robert de Ferrers, 6th Earl of Derby Isabel Ferrers Agatha Ferrers Sibyl de Ferrers William Ferrers Agnes de Ferrers Joan de Ferrers Agnes Ferrers Partners Aymeric IX, Vicomte de Rochechouart William de Vivonne