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St. Petronilla is believed to have been the daughter of St. Peter. Until the XVII Century, she was called his physical daughter, and since then, she has been thought a spiritual daughter who was consecrated to his service. Legends quoted in Manichćan documents relate that Peter cured her of a palsy. Stories found in the writings of St. Marcellus (and retold in The Golden Legend) say that Peter, who thought his daughter too beautiful, asked God to afflict her with a fever, of which he refused to cure her until she began to be perfected in the love of God. She is said to have refused Count Flaccus' hand in marriage. Traditions say she died a natural death, but accounts of her martyrdom can be found. Petronilla is thought to have been Aurelia Petronilla, a scion of the gens Flavius, the family of Vespasian and Domitian. She was also related to St. Domitilla, who was exiled in I Century to Pandateria, whose property on the Via Ardentina became a catacomb cemetary. Inscriptions there describe Petronilla as a martyr. During the papacy of Siricius (384-399), a basilica was built on the site of her tomb. In the VIII Century, Gregory III established a place of public prayer in the basilica, and her relics were translated to St. Peter's, where a chapel was dedicated in her honor. Charlemagne (d. 814) and Carlomen (d. 771) were considered adopted sons of St. Peter, and they, along with the French monarchs who succeeded them, considered Petronilla their sister. Her chapel became the chapel of the kings of France. Her emblem, like that of St. Peter, is a set of keys.
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