Cokayne's "Complete Peerage", (Essex, pp.120-121). She was the heir to the Earldom of Essex upon the childless death of her nephew William de Mandeville. She was of great age, her eldest son, WILLIAM, having predeceased her12 years earlier. Her only surviving son, Geoffrey de Say, was allowed to occupy her place, but he failed to pay the 7000 marks fine for the succession and was dissiezed. Then the husband of Beatrice's granddaughter, also named BEATRICE (DE SAY), GEOFFREY FITZPIERS, was allowed to inherit the earldom.