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Catholic Encyclopedia
St. Petronilla, virgin, martyred at Rome, probably at the end of the first century. She has been venerated as a saint since at least the fourth century. Feast day: 31 May.
For All the Saints
Hagiography of St. Petronilla raises the possibility that she is a martyr of the third century rather than the first.
The Ecole Glossary
An examination of the story of St. Petronilla. By Karen Rae Keck.