She was the half - sister of Count William II of Provence .
Born c. 986 Constance was the daughter of William I , count of Provence and Adelaide - Blanche of Anjou , daughter of Fulk II of Anjou .
Constance was the daughter     of Count William II of Provence .
Born c. 986 Constance was the daughter of William I , count of Provence and Adelaide - Blanche of Anjou , daughter of Fulk II of Anjou .