Medieval liturgy of the Dead has often been marginal, keeping in itself a complex and local organization. The example of the ritual in Albi B.M 15 (XIth century) is revealant of variations and interpretations on medieval approach of death, the defunct and the promise of an eternal life. This study of two precise and original responsories will show how the ritual is an intercession between a speaking defunct and the whole living community, how are organized apocalyptic ideas with the promised redemption.