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William was the son of William VIII of Aquitaine by his third wife, Hildegarde of Burgundy. His birth was a cause of great celebration at the Aquitanian court, but the Church at first considered him illegitimate because of his father's earlier divorces and his parents' consanguinity. This obliged his father to make a pilgrimage to Rome soon after his birth to seek Papal approval of his third marriage and the young William's legitimacy.
Early career, 1088-1102 - William inherited the duchy at the age of fifteen up on the death of his father. In 1088, at the age of only sixteen, William married his first wife, Ermengarde, the daughter of Fulk IV of Anjou. She was reputedly beautiful and well-educated, but also suffered from severe mood-swings, vacillating between vivacity and sullenness. She was considered a nag, and had a habit of retiring in bad temper to a cloister after an argument, cutting off all contact with the outside world until suddenly making a reappearance at court as if her absence had never occurred. Such behaviour, coupled with her failure to conceive a child, led William to send her back to her father and have the marriage dissolved (1091).
In 1094 he remarried to Philippa, the daughter and heiress of William IV of Toulouse. By Philippa, William had two sons and five daughters, including his eventual successor, William X. His second son, Raymond, eventually became the Prince of Antioch in the Holy Land, and his daughter Agnes married firstly Aimery V of Thouars and then Ramiro II of Aragon, reestablishing dynastic ties with that ruling house.
William invited Pope Urban II to spend the Christmas of 1095 at his court. The pope urged him to "take the cross" (i.e. the First Crusade) and leave for the Holy Land, but William was more interested in exploiting the absence on Crusade of Raymond IV of Toulouse, his wife's uncle, to press aclaim to Toulouse. He and Philippa did capture Toulouse in 1098, an act for which they were threatened with excommunication. Partly out of a desire to regain favor with the religious authorities and partly out of a wish to see the world, William joined the Crusade of 1101, an expedition inspired by the success of the First Crusade in 1099. To finance it, he had to mortgage Toulouse back to Bertrand, the son of Raymond IV
William arrived in the Holy Land in 1101 and stayed there until the following year. His record as a military leader is not very impressive. He fought mostly skirmishes in Anatolia and was frequently defeated. His recklessness led to his being ambushed on several occasions, with great losses to his own forces. In September 1101, his entire army was destroyed by the Seljuk Turks at Heraclea; William himself barely escaped, and, according to Orderic Vitalis, he reached Antioch with only six surviving companions.
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1071 - 1127 (55 years)