This place of Marian Devotion plays a major part in the imaginative world of the inhabitants of Gaume. Each year, two pilgrimages are organized, on Easter Monday and on 2nd July. On several occasions, Bonlieu, isolated in the forest, served as a refuge for the frightened population trying to flee war. Legend has it that the chapel of Bonlieu was founded in 1050 by Louis II, Count of Chiny, and his wife, to become their future burial place.
Although the chapel is situated on lands belonging to Ethe, it depends of the parish of Rouvroy.
The chapel that was erected under the Ancien Régime had a single nave. The hermitage against the southern side was composed of three adjacent rooms. In 1796, all of the buildings were razed to the ground by J.-B. Collard, commissary of the French Directory.
Today’s chapel was built according to the plans of Abbot Maréchal. As the German authorities had prohibited the consecration scheduled for 1943, the chapel was only consecrated in 1945 by Mgr Charue.