In the 3rd century CE, there was a development in the devotion to the martyrs. Close to their tombs the cultus took place. There was born a desire to be buried close to the martyrs – as close as was possible. In the 4th century CE, after the period of the persecutions, burial inside the catacombs developed as a practice. One would want a burial as close as possible to the relics of the martyrs. This idea was expressed with different terminology: ad sanctos, retro sanctos, ad sanctum Cornelium, ad dominum Caium, and so on. An inscription, preserved at Velletri, but from the Rome of the…