The Conqueror's uncle, William of Arques, who had originally challenged Duke William's right to the duchy based on his illegitimacy, had been given the county of Talou by Duke William as a fief, but still defiant and on his own authority proceeded to build a strong castle at Arques.[8] Enguerrand was allied to William of Arques by virtue of the latter being married to Enguerrand's sister.[9] By 1053 William of Arques was in open revolt against Duke William and Henry I of France came to William of Arques' aid invading Normandy and attempting to relieve the castle of Arques.[10] Duke William had put Arques under siege, but had remained mobile with another force in the countryside nearby.[11] To relieve the siege Enguerrand was with Henry I of France and on October 25, 1053 was killed when the Normans feigned a retreat in which Enguerrand and his companions followed and were ambushed, a tactic the Normans used again to great success at the Battle of Hastings.[10]
Issue
Enguerrand married Adelaide of Normandy, Countess of Aumale, daughter of Robert I, Duke of Normandy.[a][12] By her he had a daughter:
^ George Edward Cokayne, The Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, Extant Extinct or Dormant, ed. Vicary Gibbs, Vol. I (The St. Catherine Press, Ltd., London, 1910), pp. 350-2
^ Kathleen Thompson, 'Being the Ducal Sister: The Role of Adelaide of Aumale', Normandy and its Neighbours 900-1250; Essays for David Bates, ed. David Crouch, Kathleen Thompson (Brepols Publishers, Belgium, 2011), p. 68
^Kathleen Thompson, 'Being the Ducal Sister: The Role of Adelaide of Aumale', Normandy and its Neighbours 900-1250; Essays for David Bates, ed. David Crouch, Kathleen Thompson (Brepols Publishers, Belgium, 2011), p. 71
^Collectanea topographica et genealogica, Volume 6, ed. Frederic Madden, Bulkeley Bandinel, John G. Nichols (John B. Nichols & Sons, London, 1840), p. 265
^Elisabeth van Houts, The Normans in Europe (Manchester University Press, Manchester & New York, 2000), p. 68
^ abJim Bradbury, The Routledge Companion to Medieval Warfare (Routledge, NY, 2004), pp. 160-1
^David C. Douglas, William the Conqueror (University of California Press, Berkeley and Los Angeles, 1964), p. 388
^George Andrews Moriarty, The Plantagenet Ancestry of King Edward III and Queen Philippa (Mormon Pioneer Genealogy Society, Salt Lake City, UT, 1985), p. 13
^ abGeorge Edward Cokayne, The Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, Extant Extinct or Dormant, ed. Vicary Gibbs, Vol. I (The St. Catherine Press, Ltd., London, 1910), p. 351
^The name of Adelaide's mother remains unsettled. David C. Douglas [William the Conqueror, 1964, pp. 381] stated that William had a sister or half-sister Adelaide; that she may have been the daughter of Robert I by a mistress other than Herleva, but that "it is more probable she was the Conqueror's sister of the whole blood". As such the question remains open.
Sources
Barlow, Frank, ed. (1999). The Carmen de Hastingae Proelio of Guy, Bishop of Amiens. Oxford University Press. ISBN0-19-820758-1.
Musset, Lucien (2005). The Bayeux Tapestry. Boydell Press.
Paul, Nicholas L. (2012). To Follow in Their Footsteps: The Crusades and Family Memory in the High Middle Ages. Cornell University Press. When Count Hugh II of Ponthieu died in 1052, his son Enguerrand II...
Power, Daniel (2004). The Norman Frontier in the Twelfth and Early Thirteenth Centuries. Cambridge University Press. ISBN0-521-57172-3.
Tanner, Heather (2004). Families, Friends and Allies: Boulogne and Politics in Northern France and England, C.879-1160. Brill.
Hariulf (1894). Lot, Ferdinand (ed.). Chronique de l'abbaye de Saint Riquier (V siècle-1104) (in French). Alphonse Picard et Fils, Editeurs. p. 236. Gui I, comte de Ponthieu, frère d'Enguerrand II (mort en 1053).(Gui I, Count of Ponthieu, brother of Enguerrand II (died in 1053)).
Louandre, C. F. (1845). Histoire d'Abbeville et du comté de Ponthieu jusqu'en 1789 (in French). Vol. 1. T. Jeunet, Imprimeur-Editeur, rue Saint-Gilles. p. 116. "L'histoire ne nous a rien transmis sur les actions de Hugues II, sinon qu'il enrichit differents monasteres et qu'il mourut en 1052, peu de temps apres son avenement. Il laissa deux fils: Enguerrand II et Gui I..."(History has not transmitted anything to us about the actions of Hugh II, except that he enriched various monasteries and that he died in 1052, shortly after his accession. He left two sons: Enguerrand II and Gui I...)