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Otto of Aquitaine, or Eudes was the Duke of Aquitaine and Count of Poitiers between 1038 and 1039, following his brother William VI of Aquitaine. Otto was the second son of William V of Aquitaine by his wife Sancha, the heiress of Gascony. Otto died in battle.
See also: Dukes of Aquitaine family tree
| Preceded by: William VI | Duke of Aquitaine | Succeeded by: William VII |
| Count of Poitiers |