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William VI of Aquitaine (1004-1038), nicknamed the Fat, was Duke of Aquitaine and Count of Poitiers between 1030 and 1038. William was the eldest son of William V of Aquitaine by his first wife Almodis of Gevaudun. William married Eustachie of Montreuil but had no known descendents.
See also: Dukes of Aquitaine family tree
| Preceded by: William V | Duke of Aquitaine | Succeeded by: Otto |
| Count of Poitiers |