William III (died after 1037) was the count and margrave of Provence from 1014 to his death. He inherited the titles of his father Rotbold II but preceded his cousin William IV as count.Detlev Schwennicke, ''Europäische Stammtafeln: Stammtafeln zur Geschichte der Europäischen Staaten'', Neue Folge, Band II (Marburg, Germany: Verlag von J. A. Stargardt, 1984), Tafel 187 His mother was Ermengarde, later the second wife of

Rudolph III of Burgundy Rudolph III (french: Rodolphe, german: Rudolf; – 6 September 1032), called the Idle or the Pious, was the king of Burgundy from 993 until his death. He was the last ruler of an independent Kingdom of Burgundy, and the last male member of the Bu ...

. He is recorded as late as 1032 with the title of ''marchio'' and is last recorded donating property to

Cluny Cluny () is a commune in the eastern French department of Saône-et-Loire, in the region of Bourgogne-Franche-Comté. It is northwest of Mâcon. The town grew up around the Benedictine Abbey of Cluny, founded by Duke William I of Aquitaine in 9 ...

in 1037. William had no known descendants and he left his margravial rights to his sister, Emma, who married William III Taillefer,

Count of Toulouse The count of Toulouse ( oc, comte de Tolosa, french: comte de Toulouse) was the ruler of county of Toulouse, Toulouse during the 8th to 13th centuries. Originating as vassals of the kingdom of the Franks, Frankish kings, the hereditary counts ru ...

, and thus brought the margravial title in Provence to the

House of Toulouse The House of Toulouse, sometimes called ''House of Saint-Gilles'' or Raimondines, is the name of the dynasty that ruled the County of Toulouse. History Creation of the County of Toulouse The county of Toulouse is a former county in southern ...

Honoré Bouche Honoré Bouche (27 May 1599 – 16 March 1671) was a French priest and historian of Provence. Biography Honoré Bouche was born in Aix-en-Provence on 27 May 1599. He was the son of Balthazard Bouche and Louise Meyronnet. His older brother, born ...

, ''La Chorographie ou Description de Provence et l'histoire chronologique du meme pays'' (Paris, 1736), p. 864

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