Avitus of Vienne is the author of the five poetic books of the Spiritual History celebrating the importance of Christ in baptismal catechesis by the glorification of the patriarchs Adam, Noah and Moses. Catholic bishop belonging to the Gallo-Roman aristocracy, Avitus is a man of great classical learning. The present study examines Avitus? poetic style, by combining a narratological approach with the methods of traditional philology. This analysis highlights the importance of the two auctorial voices constructing the poem: the voice of the bishop, formed by the practice of the liturgy of the Word, and the voice of the poet, steeped in rhetoric and paying tribute to classical poetics. These crossing voices produce a poem accessible to a large audience, whether contemporary or posterior to the 6th century ? we know that the poem has enjoyed a wide circulation during the Middle Ages. Secondly, the analysis focuses on the construction of the poetic narrative, explores the adaptation of the epic codes to the transmission of the Christian faith and emphasizes Avitus? debt to the Latin epic poets. Finally, the stylistic and metrical study proves the perfect mastery he has of the hexameter. Avit de Vienne est l?auteur des cinq chants de l?Histoire spirituelle, qui c l bre l?importance du Christ dans la cat ch se baptismale, par la glorification des patriarches Adam, No et Mo se. v que catholique appartenant l?aristocratie gallo-romaine, Avit est un lettr d?une grande culture latine. La pr sente tude examine son criture po tique au moyen d?une approche narratologique crois e avec les m thodes de la philologie traditionnelle. Il en ressort l?importance des deux voix auctoriales construisant le po me : la voix de l? v que, form par la pratique de la liturgie de la Parole, et celle du po te, p tri de rh torique et rendant hommage la po tique classique. Ce m lange des voix auctoriales produit un po me accessible un large public, contemporain mais aussi post rieur au VIe s. ? le po me conna tra une grande diffusion au Moyen ge. L?analyse propos e permet de saisir la construction du r cit po tique, de montrer l?adaptation des codes piques la t ransmission de la foi chr tienne et de souligner la dette d?Avit envers les po tes piques latins. Enfin, l? tude stylistique et m trique prouve la parfaite ma trise de l?hexam tre de la part du po te chr tien.