Biography
William de Valence was the fourth son of Isabella of Angoulême, widow of King John, and her second husband, Hugh X of Lusignan, Count of La Marche, and was thus a half-brother to Henry III, and uncle to Edward I. William was born in the {{ill, lt=Cistercian abbey in Valence, Valence Abbey, fr, Abbaye de Valence, Couhé-Vérac, Vienne, Poitou-Charentes, nearMove to England
The French conquest of Poitou in 1246 created great difficulties for William's family, and so he and his brothers, Guy de Lusignan and Aymer, accepted Henry III's invitation to come to England in 1247.{{sfn, Chisholm, 1911, p=78 The king found important positions for all of them; William was soon married to a great heiress, Joan de Munchensi or Munchensy (c. 1230 – after 20 September 1307), the only surviving child of Warin de Munchensy, lord of Swanscombe, and his first wife Joan Marshal, who was one of the five daughters of William Marshal, a previous Earl, andSecond Barons' War
This favouritism to royal relatives was unpopular with many of the EnglishWelsh wars and death
From his base in Pembrokeshire, he was a mainstay of the English campaigns against Llywelyn ap Gruffudd and later Dafydd ap Gruffudd; in the war of 1282–3 that led to the conquest of Wales he negotiated the surrender of one of Dafydd's last remaining castles, Castell-y-Bere, with its custodian, Cynfrig ap Madog.{{Citation needed, date=November 2018 He also went several times to France on public business and he was one of Edward's representatives in the famous suit over the succession to the crown ofDescendants
William and Joan de Munchensi (described above) had the following children: * Isabel de Valence (died 5 October 1305), married before 1280 John Hastings, 1st Baron Hastings (6 May 1262 – 10 February 1313). They had: ** William Hastings (1282–1311) ** John Hastings, 2nd Baron Hastings (29 September 1286 – 20 January 1325), married to Juliane de Leybourne (died 1367). Their son Lawrence later became 1st Earl of Pembroke of the Hastings family. ** Sir Hugh Hastings of Sutton (died 1347) ** Elizabeth Hastings (1294 – 6 March 1353), married Roger Grey, 1st Baron Grey de Ruthyn. * Joan de Valence, married to John Comyn (the "Red Comyn"), Lord of Badenoch (murdered 10 February 1306), and had **John Comyn (killed 1314 at Bannockburn), married to Margaret Wake, 3rd Baroness Wake of Liddell **Joan Comyn (c. 1296–1326), married to David II Strathbogie, Earl of Atholl ** Elizabeth Comyn (1 November 1299 – 20 November 1372), married to Richard Talbot, Lord Talbot * John de Valence (died January 1277) * William de Valence (died 16 June 1282, in the Battle of Llandeilo Fawr inReferences
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Sources
*{{EB1911, wstitle=Pembroke, Earls of, volume=21, pages=78–80 *Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis, Lines: 80-29, 93A-29, 95-30, 154-29. {{s-start {{s-reg, en {{s-new, Creation {{s-ttl , title=