Asked to lecture on theological dogma to the Mont-César community, Dom Bruno proved to be a non-conformist teacher, much to the dismay of his more conservative abbot. Typically, during one of his lectures, he presented for consideration the views of Martin Luther. His lecturing duties cut short, the maverick monk was given a new assignment: mentor of the young son of the Duc de Guise, a claimant to the throne of France, living in Belgium. In recalling this unhappy episode years later, Dom Bruno laughingly exclaimed, "Me, an anarchist, teaching a prince!" Eventually, Dom Bruno resumed teaching at his monastery and contributed articles to publications devoted to ancient and medieval theology.