Rodolfo Amedeo Lanciani,
Pagan and Christian Rome
“ There is no doubt that Petronilla was buried in close proximity to this cubiculum. The story of her relationship to S. Peter has no foundation whatever; it rests on an etymological mistake, by which the name Petronilla is treated as a diminutive of Petrus, as is Plautilla of Plautius or Plautia, and Domitilla of Domitius or Domitia. Petrus is not a Latin name; it came into use with the spreading of the gospel, and only in rare and exceptional cases. The young martyr was named after a member of the same Flavian family to which this cemetery belonged, Titus Flavius Petron, an uncle of Vespasian. ”
