During the papacy of Avignon, so most cardinals are buried either in the pontifical city, or in their country of origin, some of them choose contrary to founding in their place of origin not only one religious community but also of the buildings to accommodate their tomb. They imitate in that the successive popes, in particular Clement V and Clement VI. In parallel, develops at the 14th century, under the impulse of John XXII, the creation of secular collegial news in the South of France.Pierre des Prés (1280-1361), quercynois, is a close relation of John XXII. Lawyer, it gains the confidence of the pope who created it cardinal in 1321, then invests it in 1325 load of vice-chancellor of the Church. The first part of this work is devoted to a biography of this character and also shows his desire to socially raise the members of its family.The cardinal des Prés is also, just like of other cardinals among his contemporaries, the founder of a religious community, charged to take care on his skin. If it chose secular canons, others privileged the orders Beggars. These is the choice which is examined and studied in the second part. To shelter these monks, Pierre des Prés made build a church in his native village, Montpezat-of-Quercy. Classified with the title as of Historic buildings by 1840, this building proved little known. Our study replaces collegial church Saint Martin in her context of construction, between 1337 and 1343, but also presents the materials used, the techniques employed, the job management and the men who have work on the project. Lastly, the last part tackles the question of the memory of the cardinal, built thanks to his tomb and with the many objects offered by him to its collegial chapter. Thanks to the latter, the memory of Pierre des Prés was transmitted of century in century, thus agreeing with the worms of Pétrarque: the fame overcomes death. ; Durant la papauté d'Avignon,si la plupart des cardinaux sont inhumés soit dans la cité pontificale, soit dans leur pays d'origine, certains d'entre ...