It is difficult to say where this system of depredation would have stopped, had not Benedict XIV. erected a cross in the centre of the arena, and declared the place sacred, out of respect to the blood of the many martyrs who had been butchered there during the persecution. This declaration, if issued two or three centuries before, would have preserved the Coliseum entire; it can now only protect its remains, and transmit them in their present state to posterity. Conflagrations, also, contributed to the destruction of the city. In 312 the temple of Fortuna was burned down. The palaces of Symmachus and Lampadius, with the baths of Constantine, suffered by the same cause. Nor must the destruction be confined to one element. The Tiber rose, not unfrequently, to the walls, and many inundations are recorded. Indeed, even so early as the second siege of the city by Totila, there was so much uncultivated land within the walls, that Diogenes, the governor, thought the corn, he had sown, would be sufficient to supply the garrison and citizens in a protracted defence. It is impossible to assign a precise date to the total destruction of the greater portion of the ancient site; but the calamities of the seventh and eighth centuries must have contributed to, if they did not complete, the change. A scarcity in the year 604, a violent earthquake a few years afterwards, a pestilence in or about the year 678, five great inundations of the Tiber from 680 to 797, a second famine in the pontificate of Pope Constantine, which lasted thirty-six months, a pestilence in the last year of the seventh century, and the assault of the Lombards for three months in 755;—these are the events which compose the Roman history of this unhappy period. Added to all this, the importance of the new city accelerated the ruin of the old; and great was the destruction during the periods in which separate parties fought their battles in the public streets, after the restoration of the empire of the West; in which we must record the ruin, caused by Robert Guiscard, which proved more injurious to the remains of Rome, from 1082 to 1084, than all the preceding barbarians of every age: for the Normans and Saracens of his army, with the papal faction, burned the town from the Flaminian gate to the Antonine column, and laid waste the sides of the Esquiline to the Lateran; thence he set fire to the region from that church to the Coliseum and the Capitol. He attacked the Coliseum for several days, and finished the ruin of the Capitol. A cotemporary writer says, that all the regions of the city were ruined; and another spectator, who was in Rome twelve years afterwards, laments that although what remained could not be equalled—what was ruined, could never be repaired.