The vast amphitheatre erected in the centre of ancient Rome by Vespasian was known to the ancient Romans as the Flavian Amphitheatre. It was begun by the Flavian emperors A.D. 72, and dedicated A.D. 80. It is 157 feet high, and is 1900 feet in circumference, and was built by the captive Jews after the fall of Jerusalem. Originally the upper story was of wood, but this was burned down, and it was rebuilt with travertine stone like the rest of the edifice. Martial tells us that its site was formerly occupied by the artificial lakes of Nero; and Marcellinus (xvi. x. 14) says, "The vast masses of the amphitheatre so solidly erected of Tiburtine stone, to the top of which human vision can scarcely reach." All the brickwork we now see are repairs at various dates after the dedication; but there is enough travertine left at different points to show that it was originally built of this stone, as recorded by the historian. For nearly five hundred years it was the popular resort of the Roman populace and their betters. There were eighty arches of entrance, and it held one hundred thousand people, and could be emptied in ten minutes; such were the order kept and regulations observed that there was no confusion. It was devoted to the exhibition of wild beasts, their fighting together, gladiators fighting together, or with beasts, and naval fights. On these latter displays the stage or arena was moved, water let in, and naval fights represented in real earnest. Suetonius ("Vespasian," vii.), says, "He began an amphitheatre in the middle of the city, upon finding that Augustus had projected such a work." _Ibid._ ("Titus," vi.): "He entertained the people with most magnificent spectacles, and in one day brought into the amphitheatre five thousand wild beasts of all kinds." The last display was given by Theodoric in 523; and in 555 the lower part was destroyed by a flood from the Tiber, when the whole of Rome was under water for seven days. From then we must date the ruin of the Flavian Amphitheatre--the Romans themselves hastening on the work, using the material for building purposes. "Which on its public shows unpeopled Rome, And held uncrowded nations in its womb."--JUVENAL. It is held by the Roman Church, on the authority of an inscription found in the Catacombs, that the architect of the Colosseum was one Gaudentius; but that inscription only says that he was employed there. We believe the architect to have been Aterius, whose monument is now in the Lateran, and upon which several buildings are represented of which he was no doubt the architect, also the machine used to raise the stones into their places. He flourished at the end of the first century, and, no doubt, these buildings shown in relief upon his tomb were erected by him, the dates agreeing; for if not, why should they be there represented?