Guillaume LE MARECHAL, "the Marshal", 1st Earl Of Pembroke 
- Born: 1146, , , England
- Marriage: Isabelle DE CLARE  in Aug 1189 in London, Middlesex, England
- Died: 14 May 1219, Caversham, Oxfordshire, England at age 73
- Buried: Temple Church, London, England
Other names for Guillaume were William Marshall and MARESCHAL.
"Guillaume le Maréchal (William Marshal en anglais) (vers 1145 '96 1219, Caversham), 1er comte de Pembroke, est un chevalier anglais et un tournoyeur réputé. Il est surnommé < le meilleur chevalier du monde >.
Chevalier anglo-normand, il est le fils né en Angleterre de Jean le Maréchal et de Sybille de Salisbury, sa seconde épouse. Le surnom de Maréchal remonte à son grand-père Gilbert le Maréchal, maréchal de la cour du roi Henri Ier Beauclerc, charge familiale héréditaire.
Famille et descendance
Il épousa Isabelle de Clare (vers 1171 '96 1220), fille de Richard de Clare dit Strongbow († 1176), comte de Pembroke et de Buckingham. Ils eurent cinq fils et cinq filles. Leurs fils n'eurent aucune descendance
-Guillaume dit le Jeune († 1231), 2e comte de Pembroke. Époux en secondes noces d'Aliénor d'Angleterre (1215 '96 1275), fille cadette du roi d'Angleterre Jean Ier. Elle sera ensuite l'épouse de Simon V de Montfort. Sans descendance
- Richard († 1234), 3e comte de Pembrocke, qui héritera des terres paternelles de l'honneur de Longueville. Fut assassiné à Kilkelly, Irlande. Sans descendance
- Gilbert († 1241), ecclésiastique, 4e comte de Pembroke. Sans descendance
- Gauthier († 1245), 5e comte de Pembroke. Sans descendance
- Anseau ou Aselme († 1245), 6e comte de Pembroke. Sans descendance
- Maheut (Maud), épouse d'Hugues Bigot qui deviendra 3ecomte de Norfolk, puis épouse de Guillaume IV de Warenne, 5e comte de Surrey
- Isabelle († 1240), épouse de Gilbert de Clare, 5e comte d'Hertford et 6e de Gloucester puis elle épouse Richard de Cornouailles, comte de Cornouailles puis roi des Romains, frère cadet du roi Henri III d'Angleterre
- Eve, épouse de Guillaume (V) de Briouze, seigneur de Brecknock (mourut 1230 en Galles)
- Sybille, épouse de Guillaume de Ferrières, comte de Derby
Sa devise était : < Dieu aide le Maréchal >.
Ses armes sont : parti d'or et de sinople, un lion de gueules brochant sur le tout .
La biographie de Guillaume le Maréchal émane principalement de l'Histoire de Guillaume le Maréchal, œuvre de 19 214 vers, en couplets </wiki/Couplet> rimés </wiki/Rime> octosyllabiques, rédigée peu de temps après sa mort à la demande de son fils, en anglo-normand, à partir du témoignage de son écuyer Jean D'Erlay."
"Sir William Marshal, 1st Earl of Pembroke (1147 '96 14 May 1219), also called William the Marshal (Guillaume le Maréchal), was an Anglo-Norman soldier and statesman. He was described as the "greatest knight that ever lived" by Stephen Langton . He served four kings '97 Henry II, Richard the Lionheart, John and Henry III '97 and rose from obscurity to become a regent of England for the last of the four, and so one of the most powerful men in Europe. Before him, the hereditary title of " Marshal " designated head of household security for the king of England; by the time he died, people throughout Europe (not just England) referred to him simply as "the Marshal".
William's father, John Marshal , had been a supporter of King Stephen, who took the throne in 1135, but took the part of the Empress Matilda in the ensuing civil war of succession between her and Stephen that led to the collapse of England in 1139 into "the Anarchy".
When King Stephen besieged Newbury Castle in 1152, according to William's biographer, he used the young William as a hostage to ensure that John kept his promise to surrender the castle. John, however, used the time allotted to reinforce the castle and alert Matilda's forces. When Stephen ordered John to surrender immediately or watch as he hanged William in front of the castle John replied that he should go ahead saying, "I still have the hammer and the anvil with which to forge still more and better sons!" Fortunately for the child, Stephen could not bring himself to hang young William.
Descendants of William Marshal & Isabel de Clare
- William Marshal, 2nd Earl of Pembroke (1190'966 April 1231), married (1) Alice de Béthune, daughter of Earl of Albemarle; (2) 23 April 1224 Eleanor Plantagenet, daughter of King John of England. They had no children.
- Richard Marshal, 3rd Earl of Pembroke (1191'9616 April 1234), married Gervase le Dinant. He died in captivity. They had no children.
- Maud Marshal (1194'9627 March 1248), married (1) Hugh Bigod, 3rd Earl of Norfolk, they had four children; (2) William de Warenne, 5th Earl of Surrey, they had two children; (3) Walter de Dunstanville.
- Gilbert Marshal, 4th Earl of Pembroke (1197'9627 June 1241), married (1) Marjorie of Scotland, youngest daughter of King William I of Scotland; by an unknown mistress he had one illegitimate daughter: Isabel Marshal, married to Rhys ap Maeldon Fychan.
- Walter Marshal, 5th Earl of Pembroke (c. 1199'96November 1245), married Margaret de Quincy, Countess of Lincoln, granddaughter of Hugh de Kevelioc, 3rd Earl of Chester. No children.
- Isabel Marshal (9 October 1200'9617 January 1240), married (1) Gilbert de Clare, 5th Earl of Hertford, whose daughter Isabel de Clare married Robert Bruce, 5th Lord of Annandale, the grandfather of Robert the Bruce; (2) Richard Plantagenet, Earl of Cornwall
- Sibyl Marshal (c. 1201'9627 April 1245), married William de Ferrers, 5th Earl of Derby'96they had seven daughters.
Agnes Ferrers (died 11 May 1290), married William de Vesci.
Isabel Ferrers (died before 26 November 1260)
Maud Ferrers (died 12 March 1298)
Sibyl Ferrers, married Sir Francis or Franco de Bohun.
Joan Ferrers (died 1267)
Agatha Ferrers (died May 1306), married Hugh Mortimer, of Chelmarsh.
Eleanor Ferrers (died 16 October 1274), married to:
Eva Marshal (1203'961246), married William de Braose, Lord of Abergavenny
Isabella de Braose (b.1222), married Prince Dafydd ap Llywelyn. She died childless.
Maud de Braose (1224'961301), in 1247, she married Roger Mortimer, 1st Baron Wigmore and they had descendants.
Eve de Braose (1227- 28 July 1255), married Sir William de Cantelou and had descendants.
Eleanor de Braose (c.1228- 1251). On an unknown date after August 1241, she married Sir Humphrey de Bohun and had descendants.
Anselm Marshal, 6th Earl of Pembroke (c. 1208'9622 December 1245), married Maud de Bohun, daughter of Humphrey de Bohun, 2nd Earl of Hereford. They had no children.
Joan Marshal (1210'961234), married Warin de Munchensi (d. 1255), Lord of Swanscombe
Joan de Munchensi (1230'9620 September 1307) married William of Valence, the fourth son of King John's widow, Isabella of Angoulême, and her second husband, Hugh X of Lusignan, Count of La Marche. de Valence was half-brother to Henry III and Edward I's uncle. ..."
Guillaume married Isabelle DE CLARE  [MRIN: 768], daughter of Richard Fitz Gilbert DE CLARE, "Stongbow", 2E Comte De Pembroke &Lord De Striguil  and Aoife DE LEINSTER , in Aug 1189 in London, Middlesex, England. (Isabelle DE CLARE  was born about 1172 in , , Ireland, died in 1220 and was buried in Tintern Abbey, Wales, England.)