In 249 the "days of terror" returned, and continued fiercer than ever under the rules of Decius, Gallus, and Valerianus. The last persecution, that of Diocletian and his colleagues, was the longest and most cruel of all. For the space of ten years not a day of mercy shone over the _ecclesia fidelium_. The historian Eusebius, an eye-witness, says that when the persecutors became tired of bloodshed, they contrived a new form of cruelty. They put out the right eyes of the confessors, cut the tendon of their left legs, and then sent them to the mines, lame, half blind, half starved, and flogged nearly to death. In book VIII., chapter 12, the historian says that the number of sufferers was so great that no account could be kept of them in the archives of the Church. The memory of this decade of horrors has never died out in Rome. We have still a local tradition, not altogether unfounded, of ten thousand Christians who were condemned to quarry materials for Diocletian's Baths, and who were put to death after the dedication of the building. Towards the end of 306, Maxentius stopped the persecution, but the true era of peace did not begin before 312, which is the date of Constantine's famous "edict of Milan," granting to the Church liberty and free possession of her places of worship and cemeteries forever. The events of which I have given a summary sketch are beautifully illustrated by the discoveries which have been made in early Christian cemeteries, from May 31, 1578, which is the date of the discovery of the first catacomb, to the present day. From the time of the apostles to the first persecution of Domitian, Christian tombs, whether above or below ground, were built with perfect impunity and in defiance of public opinion. We have been accustomed to consider the catacombs of Rome as crypts plunged in total darkness, and penetrating the bowels of the earth at unfathomable depths. This is, in a certain measure, the case with those catacombs, or sections of catacombs, which were excavated in times of persecution; but not with those belonging to the first century. The cemetery of these members of Domitian's family who had embraced the gospel--such as Flavius Clemens, Flavia Domitilla, Plautilla, Petronilla, and others--reveals a bold example of publicity.