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Birth:          1099 Aquitaine
Death:          19 Apr 1137 Galicia, on pilgrimage to St. Iago de Compostella

Notes
VII: Poitou, X: Aquitaine
https://en.wikipedia.org/wiki/William_X,_Duke_of_Aquitaine
William X (1099 – 9 April 1137), called the Saint, was Duke of Aquitaine, Duke of 
Gascony, and Count of Poitou (as William VIII) from 1126 to 1137. He was the son of 
William IX by his second wife, Philippa of Toulouse.

William was born in Toulouse during the brief period when his parents ruled the 
capital. His birth is recorded in the Chronicle of Saint-Maixent for the year 1099: 
Willelmo comiti natus est filius, equivoce Guillelmus vocatus ("a son was born to 
Count William, named William like himself"). Later that same year, much to Philippa's 
ire, Duke William IX mortgaged Toulouse to Philippa's cousin, Bertrand of Toulouse, 
and then left on Crusade.
Philippa and her infant son William X were left in Poitiers. When Duke William IX 
returned from his unsuccessful crusade, he took up with Dangerose, the wife of a 
vassal, and set aside his rightful wife, Philippa. This caused strain between father and 
son, until 1121 when William X married Aenor de Châtellerault, a daughter of his 
father's mistress Dangerose by her first husband, Aimery.

William had three children with Aenor:
Eleanor, who later became heiress to the Duchy;
Petronilla, who married Raoul I of Vermandois;
William Aigret, who died at age 4 in 1130, about the time their mother Aenor de 
Châtellerault died.

He possibly had one natural son, William. For a long time it was thought that he had 
another natural son called Joscelin and some biographies still erroneously state this 
fact, but Joscelin has been shown to be the brother of Adeliza of Louvain. The 
attribution of Joscelin as a son of William X has been caused by a mistaken reading of 
the Pipe Rolls pertaining to the reign of Henry II, where 'brother of the queen' has 
been taken as Queen Eleanor, when the queen in question is actually Adeliza of 
Louvain. William, called of Poitiers in the Pipe rolls may have been a half brother of 
Eleanor. Chronicler John of Salisbury tells us that Petronilla died in 1151 or 1152, after 
which her husband Raoul of Vermandois briefly remarried.

William administered his Aquitaine duchy as both a lover of the arts and a warrior. He 
became involved in conflicts with Normandy (which he raided in 1136, in alliance with 
Geoffrey V, Count of Anjou who claimed it in his wife's name) and for France.

Even inside his borders, William faced an alliance of the Lusignans and the 
Parthenays against him, an issue resolved with total destruction of the enemies. In 
international politics, William X initially supported antipope Anacletus II in the papal 
schism of 1130, opposite to Pope Innocent II, against the will of his own bishops. In 
1134 Saint Bernard of Clairvaux convinced William to drop his support to Anacletus 
and join Innocent.

In 1137 William joined the pilgrimage to Santiago de Compostela, but died during the 
trip.[1] On his deathbed, he expressed his wish to see king Louis VI of France as 
protector of his fifteen-year-old daughter Eleanor, and to find her a suitable husband. 
Louis VI naturally accepted this guardianship and married the heiress of Aquitaine to 
his own son, Louis VII.

Parents
____ William (Guillaume) VII (IX) (ABT 22 Oct 1071 - 10 Feb 1127)
____ Philippa (Mathilde) (Maud) (ABT 1073 - 28 Nov 1118)

Siblings
____ William (Guillaume) VIII (X) (1099 - 19 Apr 1137)
OF AQUITAINE Agnes (Maud) (Matilda) (ABT 1105 - ABT 1159)

Marriage To DE CHATELLERAULT Aenor (Eleanor) (ABT 1103 - AFT 1133)
    m. 1121 his first

Notes

Parents
____ Aimery (Aimeri) (Amauri) (Amalric) I (ABT 1076 - 7 Nov 1151)
DE L'ISLE BOUCHARD Dangereuse ("Maubergeonne") (1079 - 1151)

Children by DE CHATELLERAULT Aenor (Eleanor) ABT 1103 - AFT 1133
D'AQUITAINE ET POITOU Eleonore (ABT 1121 - 31 Mar 1204)
D'AQUITAINE Adelaide (Adele) (ABT 1133 - )

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