In the political context of the Interdict of Venice, Jacques Leschassier, parliamentary lawyer and correspondent of Paolo Sarpi, defended the Canons of Senlis. They had opposed their bishop, who, in accordance with Tridentine legislation, had refused them the right to grant dimissory letters. Leschassier’s victory was accompanied by the publication of scholarly works claiming to reconstitute the canon code of the primitive Church. The way the trial played out and its ecclesiological stakes help to illuminate two aspects of its reception : the enthusiastic publicity that the major Paris Gallicans made of it and, locally, the meaning of Gallican freedoms and the social consequences of the weakening of épiscopal power.