Career
She was closely related to the Merovingian royal family. Her parents, afterwards honored as Saint Walbert, Count of Guînes, and Saint 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.
Aldegundis was urged to marry, but she chose the life of the cloister.
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 monastery. Initially a double monastery, it later developed into one solely of nuns.
She bore with fortitude the breast cancer that eventually killed her. Saint Aldegundis" Catholic liturgical feast is kept on January 30.
She has been supposed to be the sister of Saint Waltrude (Waudru).
There are several early Lives, but none by contemporaries. Several of these, including the tenth-century biography by Hucbald, are printed by the Bollandists (Acta Steamship, January 11, 1034-1035).