William IX, Duke of Aquitaine and poet (d. 1126)

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William IX (Occitan: Guilhèm de Peitieus; 22 October 1071 - 10 February 1126), called the Troubador, was the Duke of Aquitaine and Gascony and Count of Poitou (as William VII) between 1086 and his death. He was also one of the leaders of the Crusade of 1101 and the first troubadour, that is, vernacular lyric poet in the Occitan language.

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.