William VI, Duke of Aquitaine
Template:Short description Template:Use dmy dates William VI (1004 – March 1038), called the Fat,Template:Sfn was Duke of Aquitaine and Count of Poitou (as William IV) between 1030 and his death. He was the eldest son of William V the Great by his first wife, Adalmode of Limoges.Template:Sfn
Conflict with his stepmother Agnes of Burgundy and life as a prisoner of war
Throughout his reign, he had to face the hostility of his stepmother, Agnes of Burgundy, the third wife of his father, who had remarried to Geoffrey Martel, then count of Vendôme. He entered into a war with Martel, who pretended to the government of the Saintonge. On 20 September 1034, he was captured in the field at Moncontour, near Saint-Jouin-de-Marnes.Template:Sfn
He was freed in 1036, after nearly three years imprisonment,Template:Sfn only by ceding the cities of Saintes and Bordeaux. He immediately reopened the war, but was defeated again and had to cede the isle of Oléron.
Marriage and succession by his half-brother
William married Eustachie of Montreuil but had no known descendants. He reformed the administration of Poitiers by naming a provost, and died there, being succeeded by his half-brother Odo. He was buried at Maillezais.
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