William De MANDEVILLE Earl of Essex/Earl of Essex

William De was born about 1176 in Of, Essex, England.  William De's father was Geoffrey FITZPETER and his mother was Beatrice De SAYE. He had two brothers and a sister, named Geoffrey De, Henry De and Maud. He had a half-brother and three half-sisters, named John, Hawise, Cicely and FITZgeoffrey.  He was buried in Priory, Shouldham, Norfolk, England.