Martinian and Processus were publicly venerated in Rome from the fourth or perhaps the third century. In the fourth century, a church was built over their tomb. At this church, Saint Gregory the Great preached a homily on their feast day ""in which he referred to the presence of their bodies, to the cures of the sick, to the harassment of perjurers, and the cure of demoniacs there."" This church no longer exists. Bede mentions Martinian and Processus, and their feast is thus known to have been celebrated in early medieval England.