He was succeeded by his brother, William FitzGeoffrey de Mandeville, 3rd Earl of Essex.
For the 13th-century 3rd Earl of the second creation see William FitzGeoffrey de Mandeville, 3rd Earl of Essex.
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They were also joined by Colonel John Dalbier, an experienced German soldier who was hated by the Roundheads, having previously served with them under the 3rd Earl of Essex until taking up arms in favour of the Cavaliers' cause.
He was the second son of Geoffrey fitz Peter and Beatrice de Say and he succeeded his elder brother Geoffrey fitz Geoffrey as earl and inheritor of the Mandeville barony.