Aldegund was closely related to the Merovingian royal family.

Her parents, afterwards honored as St. Walbert, Count of Guînes, and St. Bertilla de Mareuil, lived in the County of Hainaut.

She is the most famous of what Aline Hornaday calls the "Maubeuge Cycle" of Merovingian saints.

Having allegedly walked across the waters of the Sambre, she had built on its banks a small hospital at Malbode, which later became, under the name Maubeuge Abbey, a famous abbey of Benedictine nuns, though at a later date these were replaced by canonesses.

Several of these, including the tenth-century biography by Hucbald, are printed by the Bollandists (Acta SS., January 11, 1034–35).