These doctoral thesis consists of a paradise-focused analysis about the three meeting pagan, biblical and Christian cultures in the literary works of Latin Christian poets in the late antiquity and Early Middle Ages such as hymns, centos, epics or versified epitaphs. The Old and New Testament verses more or less dealing with the Earth or eschatological paradise make the main thraed of this study. After mentioning the variants originating from the different translations of the Holy text - wich most of the time enables one to understand the Christians poet's theories - I analyse from a mainly philological point of view the way that poets present and describe these biblical and Christian facts by calling upon their still profane culture. The patristic writings are also considered when allowing to better understand the poetic developments. I also put back the poet's ideas as much as possible in their historical, political and cultural context and in the mentality in those days so as to account for some of their choices in presenting various events such as the first couple union or who worst sinned. These doctoral thesis is divided into two major parts: the first one focuses on Eden and all that happens in there and the second one concerns the living un the beyond. The five chapters in the first part describe the garden of Eden (climate, fauna, flora and hydrography), the creation of human beings, their life un paradise, the temptation and fall, and eventually the chastisement as the different changes that are brought to the direct surroundings of Adam and Eve by sinning. The second part devoted to studying the life in the beyond is also based upon the diverse paradises encountered in the Bible. This matter is to be considered in two different and complementary aspects. The first chapter is dedicated to scanning the way that poets rearrange and depict St. Paul paradise, sinus Abrahae, the paradise promised by Jesus Christ to the thief and the heavenly Jerusalem. The second chapter is about analysing the various literary themes from profane origin that are reused and sort of reactualised by the Christian poets in order to show the life in the beyond that is so little described by the Holy text.