Sibyl de Braose Peerage person ID=158534 (b. 1149) Parents Bertha of Hereford William de Braose, 3rd Lord of Bramber Children Petronell de Ferrers Walkelin de Derby William de Ferrers, 4th Earl of Derby Agatha de Ferrers Millicent de Ferrers Siblings William de Braose, 4th Lord of Bramber Bertha de Briouse Partners William de Ferrers, 3rd Earl of Derby