But even this Latin version has not come down to us in its original form. There are numerous copies, purporting to be the Martyrology of S. Jerome, still extant, but hardly two of them agree. The copies have been amplified. The occasion of S. Jerome making his translation was as follows. At the Council of Milan, held in 390, the presiding Bishop, Gregory of Cordova, read out daily on the eve, as usual, the lists of martyrs whose anniversary was to be celebrated on the morrow. As a good number of those present knew nothing of the martyrs thus commemorated, they wrote by the hands of Chromatius, Bishop of Aquileja, and Heliodorus, Bishop of Altino, to S. Jerome, then at Bethlehem, to request him to draw up for their use a Martyrology out of the collection made by Eusebius of Caesarea. To this S. Jerome answered by letter, stating that he had got the passions of the martyrs written by Eusebius, and that he would gladly execute what was asked of him. With this letter he sent the Martyrology, with the name of a martyr to every day in the year except the first of January.[13] Unfortunately, as already said, we have not got a copy of the Martyrology unamended and unenlarged. Next in importance to the Martyrology of Jerome comes the "Martyrologium Romanum Parvum," mentioned by S. Gregory the Great, who sent a copy of it to the Bishop of Aquileja. Ado, Bishop of Vienne, saw this; it was lent him for a few days, and he made a transcript with his own hand, as he tells us in the preface to his own Martyrology, and it served him as the basis for his work. Baronius was unable to discover a copy, though he made inquiry for it, in the libraries of Italy; but it was discovered by Rosweydus, the learned Bollandist, and published by him in 1613. S. Gregory the Great, in his 29th Epistle, says, "We have the names of nearly all the martyrs with their passions set down on their several days, collected into one volume, and we celebrate the Mass daily in their honour." Cassiodorus, in his "Institution of Divine Lessons," says, "Read constantly the passions of the martyrs, which among other places you will find in the letter of S. Jerome to Chromatius and Heliodorus; they flourished over the whole earth, and provoked to imitation; you will be led thereby to the heavenly kingdom." Next in importance to the Martyrology of Jerome and the little Roman Martyrology, comes that of the Venerable Bede. In the catalogue of his own works that he drew up, he says, "I wrote a Martyrology of the natal days of the holy martyrs, in which I took care to set down all I could find, not only on their several days, but I also gave the sort of conflict they underwent, and under what judge they conquered the world." If we compare this Martyrology with the Acts of the Martyrs, we see at once that Bede took his account from them verbatim, merely condensing the narrative.