On the basis of private revelations to a nun in Naples, in consequence of the wonderful favours received in answer to prayer before the relics of the saint at Mugnano, devotion to them spread rapidly, and, after instituting investigations into the question, Gregory XVI appointed a special feast to be held on 9 September, "in honorem s. Philumenae virginis et martyris."
Loquebar de testimoniis tuis in conspectu regum, et non confundebar: et meditabar in mandatis tuis, quae dilexi nimis. * Beati immaculati in via, qui ambulant in lege Domini.
I spoke of Thy testimonies before kings, and I was not ashamed: I meditated also on Thy commandments, which I loved. * Blessed are the undefiled in the way: who walk in the law of the Lord.
(Psalm 118:46-47,1 from the Introit of Mass)
Deus, qui inter cétera poténtiae tuae mirácula etiam in sexu frágili victóriam martýrii contulísti: concéde propítius; ut, qui beátae Philomenae Vírginis et Martyris tuae natalítia cólimus, per ejus ad te exémpla gradiámur.
O God, who among the wonders of Thy power hast granted even to the weaker sex the triumph of martyrdom: mercifully grant that we who celebrate the heavenly birthday of blessed Philomena Thy virgin and martyr may, through her example, advance nearer to Thee.