According to tradition, Saint Agnes was a member of the Roman nobility born c. 291 and raised in a Christian family. She suffered martyrdom at the age of twelve^[2] or thirteen during the reign of the Roman Emperor Diocletian, on 21 January 304.

Agnes, whose name means “chaste” in Greek, was a beautiful young girl of wealthy family and therefore had many suitors of high rank. Details of her story are unreliable, but legend holds that the young men, slighted by Agnes' resolute devotion to religious purity, submitted her name to the authorities as a follower of Christianity.

Eternal God, shepherd of your sheep,
whose child Agnes was strengthened to bear witness
in her living and her dying
to the true love of her redeemer:
grant us the power to understand, with all your saints,
what is the breadth and length and height and depth
and to know the love that surpasses knowledge,
even Jesus Christ your Son our Lord,
who is alive and reigns with you,
in the unity of the Holy Spirit,
one God, now and for ever.