An aristocrat from Lotharingia who had participated in several military campaigns, Guibert withdrew as a hermit on family property in Gembloux (formerly Gemblours) inherited from his father.
Otto I, Holy Roman Emperor summoned Guibert and Erluin to his court, but was so favourably impressed with the manner in which they defended their pious undertaking that on 20 September, 946, he issued an imperial diploma approving the foundation of Gemblours and granting it various privileges.
[3] Guibert appointed his friend Erluin first Abbot of Gemblours, while he himself become a monk at the monastery of Gorze near Metz.
After his stay at Gorze Abbey in Lorraine, he returned in 954 when Hungarians invaders threatened to pillage the monastery.
[3] When Guibert died, in 962, the monks of Gembloux came to take back the corpse of their founder from the Abbey of Gorze.