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On this final day of May, when we celebrate the Queenship of Mary (which in 1954 took the place of the Feast of St. Angela Merici which was then transferred to June 1), we recall in the Sacred Liturgy a commemoration of St. Petronilla. She was a disciple of St. Peter who died in 60 AD.
The following is taken from The Liturgical Year by Abbot Gueranger:
In the eighth century, the holy Pope Paul I had the body of Petronilla taken from the cemetery of Domitilla, on the Ardeatine Way. Her relics were found in a marble sarcophagus, the lid of which was adorned, at each corner, with a dolphin. The Pope had them enshrined in a little church, which he built near the south side of the Vatican Basilica. This church was destroyed in the sixteenth century, in consequence of the alterations needed for the building of the new Basilica of St Peter; and the relics of St Petronilla were translated to one of its altars on the west side. It was but just that she should await her glorious resurrection under the shadow of the great Apostle who had initiated her in the faith, and prepared her for her eternal nuptials with the Lamb.
Thy triumph, O Petronilla, is one of our Easter joys. We lovingly venerate thy blessed memory. Thou didst disdain the pleasures and honours of the world, and thy virginal name is one of the first on the list of the Church of Rome, which was thy mother. Aid her now by thy prayers. Protect those who seek thine intercession, and teach us how to celebrate, with holy enthusiasm, the solemnities that are soon to gladden us.
Collect:
Hear us, O God, our Savior: and as we rejoice in the feast of blessed Petronilla, Thy Virgin: so we may learn a filial devotion to Thee. Through our Lord . . .