The analysis concerning the organisation of fabrics and the person-nality of the cathedrals commenders of Narbonne, Toulouse and Rodez shows that the royal administration did not play any part in the construction of these churches from 1270 onwards. The usual interpretation on the significance of these architectures, firmly inspired by northerner models, as the symbol of the annexation of Languedoc by the crown or a place dedicated to the royal cult, has to be revised. The cathedral clergy remained, at a regional level, a very important temporal lord. Quarrels with the royal administration, resulting from this statute, prove that the clergy cannot be considered as the king’s representative. Consequently, contemporaries could not identify these big ecclesiastical projects with the architecture of the king. The financial commitment of prelates was certainly important ; the interventions of Gui Fouquois in Narbonne could even suggest that prelates played the instigators’ part in the new constructions, instigators who contributed to the elaboration of the architectural concept. Then, the analysis of the situation in Toulouse, where sources attributed the construction of the new cathedral choir to one prelate, Bertrand de L'Isle Jourdain, show that episcopal contributions were not the product of a personnal patronage but that of the obligations imposed by canon law. Furthermore, the financial commitment of the prelates was assigned to the contraction of specific parts, especially the individual chapels, remembrance places of donators. The progress in the construction depended also, for a large part, on the efficient management of the external ressources and on the commitment of the chapter.