The chapel, called de l'Ermitage, is constructed on the site of Saint Hadelin's grave and nearby the cave where he retreated. Until 1789, the hermits attached to the church of Celles lived in the Hermitage, whose origins go back to the 14th century. It was restored in 1850 by the Countess Hadelin de Liedekerke, the Baroness Isabelle de Doppf.