The vast arches of the ruin called the Basilica of Constantine form, next to the Coliseum, the most conspicuous object in the neighbourhood of the Forum, and they were long supposed to have belonged to the Temple of Peace, Vespasian’s great temple. But the decision of modern archæology has assigned them to Constantine, on the ground that the brickwork is of much later date than the time of Vespasian, and also that the few remains of decoration which are extant bear indications of a great decline of ornamentative art when they were constructed. Further evidence has been derived from a coin of Maxentius, the rival of Constantine, having been found in 1828 sticking in the mortar of one of the fragments. Aurelius Victor says that the basilica called by the name of Constantine was begun by Maxentius.[36] The three gigantic arches now standing formed the roof of the eastern aisle of the basilica, which consisted, as the foundation clearly shows, of a central hall and two side aisles. The arches are sixty-eight feet in span and eighty feet high. They are ornamented by octagonal caissons or coffers, containing central rosettes and the interspaces are relieved by rhomboidal panel work. The two side arches have their backs walled up, and there are six arched windows in each wall. At the back of the central arch is a semicircular tribune, with niches for statues and a central pedestal. Some of the marble ornaments of this tribune are still left, and show in their rude execution evidence of the Constantinian style of art. A screen seems to have separated the tribune from the interior of the hall. In front of the three great arches can be plainly seen the spring of the enormous roof which covered the central hall of the basilica. This central hall must have been at least 80 feet in width and 115 feet in height. The southern aisle was of the same construction and size as the northern, and in place of the tribune had a grand entrance on the side towards the arch of Titus. A flight of steps and a portico with porphyry columns, two of which are now in the Conservatori Museum on the Capitol, formed the approach to the entrance. A white column from the central hall is to be seen erected in front of S. Maria Maggiore, where it was placed in the seventeenth century by Paul V. At the western end of the central hall was a tribune, the ruins of which are now occupied by a warehouse, and at the eastern end an entrance in three divisions opened into the road between the basilica and the portico of the so-called Temple of Venus and Rome. This entrance had a vestibule or verandah similar to those found at S. Giovanni in Laterano and at S. Maria Maggiore, and answering to the building called a chalcidicum by Vitruvius.[37] (Fig. 9, p. 33.) [Sidenote: SS. Cosma and Damiano.]