Relics and Veneration
After her death a chapel was built over her grave, which grew famous for her relics and miracles and became the nucleus of the town of La Capelle, whose name derives from that chapel. Her relics were believed to possess miraculous properties and were moved on several occasions. During the conflicts of the fifteenth century her remains were transferred to the abbey of regular canons at Hennin Lictard, between Douai and Lens, where, according to Butler, she was venerated alongside another martyr named Proba.
Grimonia is commemorated on September 7. Because the surviving accounts of her life are traditional and late, the details beyond her Irish origin, her flight to Gaul, and her martyrdom near La Capelle are uncertain.