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William de Valence
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Birth: 1230
Departement de la Vienne
Poitou-Charentes, France
Death: May 16, 1296, France

William de Valence, 1st Earl of Wexford and 1st Earl of Pembroke, born Guillaume de Lusignan or de Valence was a French nobleman and Knight, who became important in English politics due to his relationship to Henry III. He was heavily involved in the Second Barons' War, supporting the King and Prince Edward against the rebels led by Simon de Montfort. He took the name de Valence ("of Valence").
He was the fourth son of Isabella of Angoulême, widow of king John of England, and her second husband, Hugh X of Lusignan, Count of La Marche, and was thus a half-brother to Henry III of England, and uncle to Edward I. William was born at Valence, near Lusignan.
William was soon married to a great heiress, Joan de Munchensi or Munchensy (c. 1230 – after September 20, 1307), Lady of Swanscombe and Countess of Pembroke, the only surviving child of Warin de Munchensi, Lord of Swanscombe and Earl of Pembroke, and wife Joan Marshal, daughter and eventual co-heiress of William Marshal, 1st Earl of Pembroke and Isabel de Clare, 4th Countess of Pembroke suo jure.
William and Joan de Munchensi (described above) had the following children:
Isabel de Valence (d. October 5, 1305), married before 1280 John Hastings, 1st Baron Hastings (May 6, 1262 – February 10, 1313). Their grandson Lawrence later became earl of Pembroke. They had:
William Hastings (1282 – 1311)
John Hastings, 2nd Baron Hastings (September 29, 1286 – January 20, 1325), married to Juliane de Leybourne (d. 1367)
Sir Hugh Hastings of Sutton (d. 1347)
Joan de Valence, married to John Comyn (the "Red Comyn"), Lord of Badenoch (d. murdered, February 10, 1306), and had
Elizabeth Comyn (November 1, 1299 – November 20, 1372), married to Richard Talbot, Lord Talbot
John de Valence (d. January, 1277)
William de Valence (d. in the Battle of Llandeilo Fawr in Wales in June 16, 1282), created Seigneur de Montignac and Bellac
Aymer de Valence, 2nd Earl of Pembroke and Wexford in 1296 (c. 1270 – June 23, 1324), married firstly to Beatrice de Clermont and married secondly to Marie de Chatillon
Margaret de Valence
Agnes de Valence (b. about 1250) 
Family links: 
  Hugh De Lusignan (1183 - 1249)
  Isabella of Angoulême (1188 - 1246)
  John de Valence (____ - 1277)*
  Margaret de Valence*
  Aymer de Valence (1275 - 1324)*
   King Henry (1207 - 1272)**
  Richard of Cornwall (1209 - 1272)**
  Joan Plantagenet (1210 - 1238)**
  Isabelle Plantagenet (1214 - 1241)**
  Eleanor Plantagenet (1215 - 1275)**
  Hugh Lusignan (1220 - 1255)*
  Alice De Lusignan De Warenne (1229 - 1256)*
  William de Valence (1230 - 1296)
*Calculated relationship
Westminster Abbey
City of Westminster
Greater London, England
Plot: St Edmund's Chapel
Created by: Kat
Record added: Jul 29, 2012
Find A Grave Memorial# 94427168
William de Valence
Added by: nbo
William de Valence
Added by: nbo
William de Valence
Added by: nbo
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In loving memory of my 20th Great Greandfather.
- Lisa
 Added: Jul. 24, 2014

- tbeck
 Added: Feb. 14, 2014
In memory of my 24th great-granduncle.
- Helen Rineer
 Added: Sep. 6, 2012
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