Agrestius Chromatius was vicar to the prefect of Rome, and had condemned several martyrs in the reign of Carinus; and in the first years of Diocletian, St. Tranquillinus, being brought before him, assured him that, having been afflicted with the gout, he had recovered a perfect state of health hy being baptized. Chromatius was troubled with the same distemper, and being convinced by this miracle of the truth of the Gospel, sent for a priest, and, receiving the Sacrament of Baptism, was freed from that corporal infirmity. Chromatius's son, Tiburtius, was ordained subdeacon, and was soon after betrayed to the persecutors, condemned to many torments, and at length beheaded on the Lavican Road, three miles from Rome, where a church was afterward built. His father, Chromatius, retiring into the country, lived there concealed, in the fervent practice of all Christian virtues.
ST. SUSANNA was nobly born in Rome, and is said to have been niece to Pope Caius. Having made a vow of virginity, she refused to marry, on which account she was impeached as a Christian, and suffered with heroic constancy a cruel martyrdom. St. Susanna suffered towards the beginning of Diocletian's reign, about the year 295.
Butler's LIVES OF THE SAINTS .