Almost all the 6th- and 7th-century lists of the tombs of the most highly venerated Roman martyrs mention St. Petronilla's grave as situated in the Via Ardeatina near Sts. Nereus and Achilleus. These notices have been completely confirmed by the excavations in the Catacomb of Domitilla. One topography of the graves of the Roman martyrs, "Epitome libri de locis sanctorum martyrum", locates on the Via Ardeatina a church of St. Petronilla, in which Sts. Nereus and Achilleus, as well as Petronilla, were buried.