Born Constance was the daughter of William I, count of Provence and Adelaide-Blanche of Anjou, daughter of Fulk II of Anjou. She was the half-sister of Count William II of Provence. Constance was married to King Robert, after his divorce from his second wife, Bertha of Burgundy. The marriage was stormy; Bertha's family opposed her, and Constance was despised for importing her Provençal kinfolk and customs. Robert's friend, Hugh of Beauvais, count palatine, tried to convince the king to repudiate her in 1007. Possibly at her request 12 knights of her kinsman Fulk Nerra then murdered Beauvais in 1008. In 1010 Robert went to Rome, followed by his former wife Bertha, to seek permission to divorce Constance and remarry Bertha. Pope Sergius IV was not about to allow a consanguineous marriage which had been formally condemned by Pope Gregory V and Robert had already repudiated two wives. So the request was denied. After his return according to one source Robert "loved his wife more." In 1022, a trial accused clergy members of heresy--Constance's previous confessor Stephen included, Robert had his wife Queen Constance stand at the door to prevent any mob violence. However, as the condemned clerics left the trial the queen "struck out the eye of Stephen... with the staff which she carried". This was seen as Constance venting her frustration at anyone subverting the prestige of the crown.
At Constance's urging, her eldest son Hugh Magnus was crowned co-king alongside his father in 1017. But later Hugh demanded his parents share power with him, and rebelled against his father in 1025. Constance, however, on learning of her son's rebellion was furious with him, rebuking him at every turn. At some point Hugh was reconciled with his parents but shortly thereafter died, probably about age eighteen. The royal couple was devastated; there was concern for the queen’s mental health due to the violence of her grief. Robert and Constance quarrelled over which of their surviving sons should inherit the throne; Robert favored their second son Henry, while Constance favored their third son, Robert. Despite his mother's protests and her support by several bishops, Henry was crowned in 1027. Constance, however, was not graceful when she didn't get her way. The ailing Fulbert, bishop of Chartres told a colleague that he could attend the ceremony "if he traveled slowly to Reims—but he was too frightened of the queen to go at all". Constance encouraged her sons to rebel, and they began attacking and pillaging the towns and castles belonging to their father. Son Robert attacked Burgundy, the duchy he had been promised but had never received, and Henry seized Dreux. At last King Robert agreed to their demands and peace was made which lasted until the king's death. King Robert died on 20 July 1031. Soon afterwards Constance fell ill; she was at also at odds with both her surviving sons. Constance seized her dower lands and refused to surrender them. Henry fled to Normandy, where he received aid, weapons and soldiers from his brother Robert. He returned to besiege his mother at Poissy but Constance escaped to Pontoise. She only surrendered when Henry began the siege of Le Puiset and swore to slaughter all the inhabitants. Constance died after passing out following a coughing fit on 28 July 1032 and was buried beside her husband Robert at Saint-Denis Basilica.
