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William was son of Ebalus of Aquitaine and Emiliene. He married Adele of Normandy and had at least two children: Adelaide, who married king Hugh I of France (Hugh Capet) and William, the heir.
See also: Dukes of Aquitaine family tree
| Preceded by: Ebalus | Duke of Aquitaine | Succeeded by: William IV |
| Count of Poitiers |