With two disciples, Lambert and Berler, he made a clearing in the vicinity of Castrilocus (now Mons, in Hainault), taking up later his abode at a place called Ursidongus, where he built an oratory or chapel dedicated to Peter and Paul the Apostle.

[1] Aubert of Avranches summoned him to the episcopal presence in order to sound the intentions of this almost unknown hermit, but he afterwards accorded him efficient protection.

[1] It is probable that Ghislain influenced the religious vocation of Aldegonde, Abbess of Maubeuge, also of Amalberga and Aldetrude, of whom the first was the sister and the last two the daughters of Waltrude.

They were transferred to Grandlieu, near Quaregnon, about the end of the tenth century or the beginning of the eleventh, and in 1025 Gerard of Florennes, Bishop of Cambrai, removed them to Le Cateau-Cambrésis.

This is an allusion to the popular legend which relates that a bear, pursued in the chase by King Dagobert I, sought refuge with Ghislain and later showed him the place where he should establish a monastery.