... Justina suffered at Padua, and became the patron saint of that city, whose university made its peculiarities everywhere known.  The purity of St. Justina caused her emblem to be the unicorn, since that creature is said to brook no rule but that of a spotless maiden; and poison always became manifest at the touch of its horn, for which the twisted weapon of the narwhal did duty in collections.  The great battle of Lepanto was fought on St. Justina's day, and the victory was by the Venetians attributed to her intercession; so that Giustina at Venice, Justine in France, came for the time into the foremost ranks of popularity... (History of Christian Names, Yonge, 1883)