William FitzGeoffrey de Mandeville, 3rd Earl of Essex
William fitz Geoffrey de Mandeville was the third Earl of Essex of the second creation from 1216 to his death. He was the second son of Geoffrey Fitz Peter and Beatrice de Say and he succeeded his elder brother Geoffrey FitzGeoffrey as earl and inheritor of the Mandeville barony. He was married to Christina, one of Robert FitzWalter's daughters, but died on 8 January 1227, without heirs and the earldom became extinct.Citations
