Waltrude was a 7th-century Benedictine abbess born into a wealthy noble family in Cousolre. After marrying Vincent Madelgarius, the Count of Hainault, she eventually retired to a religious life following the death of her son, Dentelin. She is credited with encouraging the establishment of an oratory at Ursidongus, a site that eventually developed into the city of Mons. Recognized for her piety and her efforts to ransom captives using her own wealth, she is remembered as a significant religious figure in the region.