It is clearly defined, in Quebec civil law, that ‘sacred things are excluded from being objects of commerce’. However, we might ask the following question: In order to determine how an object gets or loses its sacred character, do we have to refer to the internal rules of the various religious societies or instead, to the rules of civil law? It is that precise but difficult question, on which Quebec civil law does not say a word, that is raised principally by the case of the treasures of l'Ange-Gardien.