"Before the year A.D. 107 the splendours of the city and the Campus beyond it were still separated by a narrow isthmus, thronged perhaps by the squalid cabins of the poor, and surmounted by the remains of the Servian wall which ran along its summit. Step by step the earlier emperors had approached with their new forums to the foot of this obstruction. Domitian was the first to contemplate and commence its removal. Nerva had the fortune to consecrate and to give his own name to a portion of his predecessor's construction; but Trajan undertook to complete the bold design, and the genius of his architect triumphed over all obstacles, and executed a work which exceeded in extent and splendour any previous achievement of the kind. He swept away every building on the site, levelled the spot on which they had stood, and laid out a vast area of columnar galleries, connecting halls and chambers for public use and recreation. The new forum was adorned with two libraries, one for Greek, the other for Roman volumes, and it was bounded on the west by a basilica of magnificent dimensions. Beyond this basilica, and within the limits of the Campus, the same architect (Apollodorus) erected a temple for the worship of Trajan himself; but this work probably belonged to the reign of Trajan's successor, and no doubt the Ulpian forum, with all its adjuncts, occupied many years in building. The area was adorned with numerous statues, in which the figure of Trajan was frequently repeated, and among its decorations were groups in bronze or marble, representing his most illustrious actions. The balustrades and cornices of the whole mass of buildings flamed with gilded images of arms and horses. Here stood the great equestrian statue of the emperor; here was the triumphal arch decreed him by the senate, adorned with sculpture, which Constantine, two centuries later, transferred without a blush to his own, a barbarous act of this first Christian emperor, to which however we probably owe their preservation to this day from more barbarous spoliation."--_Merivale, Romans under the Empire_, ch. lxiii.