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Constantine, with his seize of power in the early fourth century, has allowed the growth of a new form of devotion dedicated to the men and women tormented because of their beliefs in Christ and his Holy Father. Thereby, Lawrence, persecuted in 258 A.D. in Rome, has become the main figure of martyrdom in the Eternal City during the following century. This master's thesis aims at comprehending how the cult of Lawrence's unfolded and why it became the predominant martyr cult in the Roman capital. By studying literary and epigraphic sources, especially Damasus, Ambrose, Augustine and Prudence, as well as the archaeological data on the construction of the churches dedicated to Lawrence, we came to the conclusion that the Roman martyr helped establish a Christian collective memory corresponding to the identity needs of the Urbs in this period characterized by the passage of a "pagan" empire to a Christian empire. This creation of a collective memory is based on the sacralisation of the roman territory by the emperor Constantine and the roman bishop Damasus, on the introduction of new rituals and on the instrumentation of Lawrence and the cult of the saints by the ancient writers in their elaboration of a Christian identity for the city of Rome.