Of noble parentage, Hadelin lived at the court of Sigebert of Austrasia.
Hadelin eventually retired to live as a hermit near Chelles, where he died around 690.
[4] Hadelin is especially venerated in the Walloon diocese of Namur, as founder of the monastery of Celles.
He is the patron of Celles, where he is celebrated on the Sunday following the Nativity of the Blessed Virgin (September 8).
[5][6] Hadalinus is invoked against children's ailments; in iconography his attribute is a dove.