Petronell de Ferrers Peerage person ID=581771 (b. 1190) Parents William de Ferrers, 3rd Earl of Derby Sibyl de Braose Children Hervey de Stafford Robert de Stafford Siblings Walkelin de Derby Millicent de Ferrers Agatha de Ferrers William de Ferrers, 4th Earl of Derby Partners Hervey de Stafford