Earl William De Mandeville ESSEX
- Born: Abt 1144-1147, Rycott, Oxfordshire, England
- Married (1): , , England
- Married (2): 1170, Eaton, Socon, Bedfordshire, England
- Died: 14 Nov 1189-1190, , , England
Other names for William were ESSEX Earl and Justiciar.
Ancestral File Number: 8XJT-Q3.
Earl of ESSEX 1169-1189, Justiciar 1169-1189.
The Political History of England, Vol II, George Burton Adams Longmans Green and Co, 1905, Ch XIV, p308:
 "...Henry had on his side also a goodly list of English earls: the illegitimate members of his house, Hamelin of Surrey, Reginald of Cornwall, and William of Gloucester; the earls of Arundel, Pembroke, Salisbury, Hertford, and Northampton; the son of the traitor of his mother's time, William de Mandeville, Earl of Essex; and William of Beaumont, Earl of Warwick, whose cousins of Leicester and Meulan were of the young king's party. The new men of his grandfather's making were also with him and the mass of the middle class."
p364:  "...The responsibility of the justiciarship was at the same time divided between Bishop Hugh of Durham and the Earl of Essex, who, however, shortly died, and in his place was appointed William Longchamp..."
p395:  "...William was at last formally invested with the earldom of Pembroke and Geoffrey Fitz Peter with that of Essex..."
Ancestral File Ver 4.10 8XJT-Q3 Born 1144 Rycott Oxford, IGI Birth 7330401-94-822324 DE MANDIVILLE 1147 Chingford Essex.
INTERNATIONAL GENEALOGICAL INDEX
IGI Birth 7330401-94-822324 William DE MANDIVILLE Father Geoffrey DE MANDIVILLE 1147 Chingford Essex England.
IGI Marriage 7330511-28-822333 William DE MANDIVILLE Spouse Olive DE BEAUCHAMP 1170 Eaton Socon Bedford England.
IGI Birth 7330401-94-822324 Anne or Amice DE MANDIVILLE Father William DE MANDIVILLE Mother Olive DE BEAUCHAMP 1170 Chingford Essex England.
William married Hawise De GROS in , , England.
William also married Olive De BEAUCHAMP in 1170 in Eaton, Socon, Bedfordshire, England.