The cult of relics, encouraged by, among others, the emperor Constantine, Pope Damasus and the bishops Ambrose of Milan and Paulinus of Nola, led to the transformation of the Late Antique Italian landscape, and of suburban areas in particular. The process of gradual enhancement of the martyrs' tombs led to the creation of extensive sanctuaries, generally composed of funerary and cultic buildings, as well as service structures, pilgrims' lodgings and monasteries. The most important sanctuaries, such as those of Saints Peter in the Vatican, Paul on the Ostiense, Erasmus in Formia, Alexander in...