Cyprien La Cave La Plagne-Barris, Cartulaires du chapitre de l'église métropolitaine Sainte-Marie d'Auch, 2 vols. (Paris: Champion, 1899), i, pp. 157–64, doc. CXXXIIII.
Marca was motivated in part to explain an unusual inscription reported by Arnauld de Oihenart on the wall of the church of Sainte-Quitterie d'Aire. This inscription may never have existed, and in any case is now lost. It recorded the burial in the church of one "William, count, margrave and duke of the Gascons", brother of García, count of Agen. Marca supposed that this William was an uncle and regent of Bernard.[4]
