Robert de Ferrers, 6th Earl of Derby English noble (1239–1279) Parents Margaret de Quincy, Countess of Derby William de Ferrers, 5th Earl of Derby Children Alianore de Ferrers John de Ferrers, 1st Baron Ferrers of Chartley Siblings Elizabeth Ferrers William Ferrers Joan de Ferrers Agnes de Ferrers Joan de Ferrers Alianore de Ferrers Isabel Ferrers Agatha Ferrers Sibyl de Ferrers Maud Ferrers Agnes Ferrers Partners Marie de Lusignan Alianor de Bohun
