Trajan's great buildings—his forum and triumphal arch, his basilica and library—are represented by a very small excavated portion of the basilica, and the column whose summit marks the height of the hill cut away by this emperor to make a roadway between the Quirinal and Capitol and thus relieve the congested traffic of the city.
The only fragments left of the work of Hadrian are the ruins of a villa near Tivoli, the mausoleum and Pons Aelius, now the castle and bridge of S. Angelo; and behind the church of S. Francesca Romana in the Forum the ruins of the Templum Urbis, the temple of Venus and Rome, with its twin niches for the gods, one turned towards the convent the other looking outwards towards the Colosseum. The gilt bronze tiles from the roof of this temple were removed by Pope Honorius I. to deck the Christian Templum Urbis S. Peter's.
During the following 140 years there arose in Rome, amongst other monuments that have perished, the temple of Antoninus and Faustina built by Antoninus Pius in memory of his wife and now transformed into the church of S. Lorenzo in Miranda, the column of Marcus Aurelius, the triumphal arch of Septimius Severus dedicated to his sons Caracalla and Geta, the baths which bear this eldest son's name, although only begun by him and completed by Heliogabalus and Alexander Severus, the walls of Aurelian which still encompass the city and the thermae of Diocletian. The latest of the imperial buildings were the temple built by Maxentius to his son Romulus, now the church of SS. Cosma and Damian in the Forum, and the baths, basilica, and triumphal arch of Constantine.
A visitor to this city of the Cæsars must have been almost bewildered by what he saw. As he passes through the town great buildings meet his glance on every side, their gilded tiles and white marble walls glistening in the sun and clear atmosphere. Crowds jostle him in the narrow paved roads. He crosses one Forum after another, six in all, and finally reaches the Campus Martius. He pauses upon the steps of temples and basilicas which seem on all sides to surround these busy centres of Roman life. Open spaces are crowded with trees and shrubs, fountains and statues. He can count thirty-six triumphal arches and eight bridges that span the yellow Tiber. He passes theatres and stadia for races and games, columns and obelisks. Occasionally he comes across a giant building, a colossus even in that city of marvels, the amphitheatre of Vespasian or the thermae of Diocletian, or an immense circus where 285,000 spectators are seated waiting for the chariot races to begin; he has noticed groups of charioteers in their distinctive colours, and heavy betting is going on. He has walked from one end of the city to the other sheltered from sun and rain, along covered porticoes, their pavements rich mosaics, and their length decorated throughout with a continuous series of statues and pictures. He has gazed upon the stupendous palaces of the Palatine, and has noticed the streams of people passing in and out of the city gates on their way to the suburbs which extend to Veii Tivoli and Ostia, or to the villas, parks and gardens, villages and farms, which cover the outskirts of Rome to a distance of 15 miles, amongst which great roads lined by marble tombs radiate outwards towards the hills.
With the decay of this mighty city began the era of church building. The origin of the Christian basilica is still a matter of controversy, but the results of careful and recent research[1] go to confirm the view that it was modelled not upon its Pagan namesake the forensic basilica, but upon the private hall found in many of the dwellings of rich Romans of consular or senatorial rank which served for those domestic tribunals for the adjudication of family disputes sanctioned by Roman law. This conclusion has been overlooked from a mistaken belief that the first Christians were recruited from the slaves and poorer classes of the population, but it is now proved that noble Romans and even members of Imperial families early embraced Christianity, and it was more than probable that the domestic basilicas in their houses should be utilised as places of assembly by members of their faith, the gathering of a large body of persons being concealed during times of persecution, by the use of the many entrances common to the Roman house.
The domestic basilica dedicated as a place of Christian assembly, became with the development of the ecclesiastical system, the Roman titulus, the church in the house, and as no public hall was built until after the Peace of the church, these were multiplied as the Christian population grew and numbered 40 by the second century. The Christian basilica was thus in existence and perfected in all its liturgical parts in the first three centuries, and when Constantine built his great extramural churches, he only amplified a type familiar to every Christian.
THE COLOSSEUM AT SUNSET
Taken from the Mons Oppius, one of the two spurs of the Esquiline hill. See pages [5], [11].
S. Maria Maggiore probably existed as a domestic basilica at a time anterior to that of its reputed founders Liberius and Sixtus, and we know that S. Croce and the Lateran were constructed within the Sessorian palace and the house of the Laterani of which they probably formed the halls.