sentences:  His mother was Ermengarde, later the second wife of Rudolph III of Burgundy.He is recorded as late as 1032 with the title of "marchio" and is last recorded donating property to Cluny 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, and thus brought the margravial title in Provence to the House of Toulouse.