William IX, Duke of Aquitaine
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| William IX | |
Duke of Aquitaine
| |
| In office 1086–1127 | |
| Preceded by | William VIII |
|---|---|
| Succeeded by | William X |
| Born | 1071 |
| Died | February 10, 1127[1] Poitiers, Kingdom of France |
William IX (October 22, 1071 – February 10, 1127) was Duke of Aquitaine and the first Troubadour whose work still survives.