It is thus clearly established that Petronilla was venerated at Rome as a martyr in the 4th century, and the testimony must be accepted as certainly historical, notwithstanding the later legend which recognizes her only as a virgin (see below). Another known, but unfortunately no longer extant, memorial was the marble sarcophagus which contained her remains, under Pope Paul I translated to St. Peter's Basilica. In the account of this in the "Liber Pontificalis" the inscription carved on the sarcophagus is given thus: "Aureae Petronillae Filiae Dulcissimae" ("of the golden Petronilla, the sweetest daughter"). The sarcophagus was discovered, in the very chapel dedicated to her in Old St Peter's, under Pope Sixtus IV, who hastened to inform Louis XI of France. Extant 16th-century notices concerning this sarcophagus assert that the first word was "Aur," (Aureliae), so that the martyr's name was Aurelia Petronilla. The second name comes from "Petro" or Petronius, and, as the name of the great-grandfather of the Christian consul, Titus Flavius Clemens, was Titus Flavius Petro, it is very possible that Petronilla was a relative of the Christian Flavii, who were descended from the senatorial family of the Aurelii. This theory would also explain why Petronilla was buried in the catacomb of the Flavian Domitilla. Like the latter, Petronilla may have suffered during the persecution of Domitian, perhaps not till later.