William III of Provence
Encyclopedia
William III (died after 1037) was the Count and Margrave of Provence from 1014 to his death. He inherited his titles from his father Rotbold III
Rotbold III of Provence
Rotbold III was the Count and Margrave of Provence from 1005 to his death. He was the only son of Rotbold II and Emilde, daughter of Stephen, Viscount of Gévaudan. He inherited all his father's titles on his death in 1008...

.

His mother was Ermengard, later the second wife of Rudolph II of Burgundy
Rudolph II of Burgundy
Rudolph II was king of Upper Burgundy , Lower Burgundy , and Italy . He was the son of Rudolph I, king of Upper Burgundy, and it is presumed that his mother was his father's known wife, Guilla of Provence...

. He is recorded as late as 1032 with the title of marchio and is last recorded donating property to Cluny
Cluny
Cluny or Clungy is a commune in the Saône-et-Loire department in the region of Bourgogne in eastern France. It is 20 km northwest of Mâcon.The town grew up around the Benedictine Cluny Abbey, founded by Duke William I of Aquitaine in 910...

in 1037. He married Lucia, but had no known descendants, leaving his margravial rights to his cousin.

Sources

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