William III, Count of Toulouse

William III, Count of Toulouse
Spouse(s)	Emma of Provence
Noble family	House of Rouergue
Father	Raymond, Prince of Gothia
Mother	Adelais of Anjou
Born	c. 970
Died	September 1037

William III Taillefer (also spelled Tallefer or Tallifer; c. 970 – September 1037) was the Count of Toulouse, Albi, and Quercy from 972 or 978 to his death. He was the first of the Toulousain branch of his family to bear the title marchio, which he inherited (c.975) from Raymond II of Rouergue.

His parentage has been subject to reevaluation. He has traditionally been called son of Raymond III Pons and Garsinda. However, recent research has revealed that William was instead son of Adelais of Anjou, known to have married a Raymond, "Prince of Gothia". This discovery has required a complete reevaluation of the succession to the County of Toulouse during this period, and no scholarly consensus has developed.

He and his vassals were notorious usurpers of church property. He stole from the abbey of Lézat, but gave it back between 1015 and 1025. Pope John XIX ordered him to stop his vassals from taking the lands of Moissac, a problem later remedied by his successor, Pons, who gave Moissac to Cluny.

William became the most powerful prince in western Languedoc and he saw the rise of the House of Capet in France and a corresponding decrease in royal authority recognised in the south. He bore the title of marchio prefatus in pago Tholosano: "prefect margrave in the Toulousain country." His influence extended into the Narbonensis and even Provence, on behalf of his wife. His power did not remain undiminished in his own city of Toulouse, where he was forced by a council of local noblemen and clerics to give up dues imposed on the market there.

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