Tertullian[10] says that on the natal days, that is, on the days of martyrdom of the Saints who have suffered for Christ, "We keep an annual commemoration." It is easy to see how this usage necessitated the drawing up of lists in which were inscribed not only the names of the martyrs, and the place of their decease, but also a few words relative to their conflict, so that the people might associate their names with their victories, and the names might not become, in time, to them empty sounds. S. Cyprian was absent from Carthage when the persecution was raging there, but he wrote to his clergy, "Note the days of their death, that we may celebrate their commemorations along with the memorials of the martyrs."[11] S. Augustine says,[12] "The Christian people celebrate the memory of the martyrs with religious solemnity, both to excite to imitation, and that they may become fellows in their merits and be assisted by their prayers." Adrian I. quotes the 13th Canon of the African Church and the 47th of the third Carthaginian Council, in a letter to Charlemagne, in which he says, "The Sacred Canons approved of the passions of the Holy Martyrs being read in Church when their anniversary days were being celebrated." The names of the martyrs to be commemorated were announced on the eve. By degrees other names besides those of martyrs were introduced into the Martyrologies, as those of faithful servants of God whose lives were deserving of imitation, but who had not suffered to the death in testimony to the truth. Thus we have confessors, or those who endured hardships for Christ, doctors, or teachers of the Church, virgins, widows, bishops and abbots, and even penitents. The Martyrologies may be divided into two series, the ancient and the modern. We need only concern ourselves with the Ancient Martyrologies. The first to draw up a tolerably full Martyrology was Eusebius the historian, Bishop of Caesarea in Palestine, and he did this at the request of the Emperor Constantine. In this Martyrology he noted all the martyrs of whom he had received an authentic account on the days of their suffering, with the names of the judges who sentenced them, the places where they suffered, and the nature of their sufferings. Eusebius wrote about A.D. 320, but there were collections of the sort already extant, as we may learn from the words of S. Cyprian already quoted, who in his instructions to his clergy ordered them to compile what was practically a Martyrology of the Carthaginian Church. We have not got the Greek Martyrology of Eusebius, but we have the Latin version made by S. Jerome. Bede says of this, "Jerome was not the author, but the translator of this book; Eusebius is said to have been the author."