St. Catherine of Alexandria is a most noted example of the erudition often attained and displayed by Christian women. At the age of eighteen, says the _Breviarium Romanum_, she outstripped in knowledge the most learned men of her day: Maximinus, who was both a libertine and a tyrant, was cruelly persecuting the Christians of Alexandria, and dishonoring the noble matrons of that city. Catherine boldly and publicly upbraided him, and forced him to listen to her arguments. Her _Acts_ and the Greek _Menology_ of the Emperor Basil affirm that she supported her thesis of Christianity against the arguments of forty of the ablest heathen philosophers, and so effectually confuted them that they preceded her in her martyrdom by declaring themselves Christians, and being forthwith condemned to be burned alive. Catherine, during her imprisonment, converted the wife of Maximinus, and the commander of his army, and further made such an impression upon the crowd assembled to witness her death that many became Christians on the spot. The interesting Church of San Clemente, in Rome, contains one chapel, the walls of which are covered with frescoes illustrative of each of these occurrences; this chapel is supposed to date from the fourth or fifth century, and is a mute witness to the honor with which the memory of the illustrious and learned maiden of Alexandria was, even at that early age, surrounded. Butler, in his _Lives of the Saints_, says of her: “From this martyr’s _uncommon erudition_, ... and the use she made of it, she is chosen in the schools the _patroness_ and _model_ of Christian philosophers.” This is by no means the only instance of a woman being honored as patroness in the roads of learning or of art. Later on, we shall have occasion to speak of other saints equally distinguished for their talents and zeal for true philosophy. Butler says in a foot-note to the _Life of St. Catherine_: “The female sex is not less capable of the sublime sciences, nor less remarkable for liveliness of genius. Witness, among numberless instances in polite literature and in theology, the celebrated Venetian lady, Helen Lucretia Cornaro, doctress in theology at Padua in 1678, the _wonder_ of her age for her skill in _every_ branch of literature, and, still more, for the austerity of her life and her extraordinary piety.”