Abstract: Agrippa d’Aubigné ends his Histoire universelle with an account of Biron’s conspiracy. The maréchal’s plot is indicative of the hostility which existed towards a newly converted king and a Protestant body weakened by the proclamation of the edict of Nantes. The versions that the author gives in his historical account, pamphlet, autobiography, and Écrits politiques opposes the emblematic image of the conspirator with that of a “firm” witness to the “truth” of history.