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 original forum (Cic., ad Att., iv. 16). The basilica was a structure intended for the same purposes. It was to all intents and purposes a covered forum, and in its normal form was constituted by an arrangement of colonnades in two stories round a rectangular space, that was not, like the Greek agora, open, but covered with a roof. Vitruvius writes of it as frequented by merchants, who would find in it shelter and quiet for the transaction of their business. Legal tribunals were also set up in it, though it is a mistake to suppose the basilica a mere law court. The magistrates who presided over these tribunals had sometimes platforms, curved or rectangular in plan, provided as part of the permanent fittings of the edifice.

According to Vitruvius (v. 1. 4, cf. also vi. 3. 9) the building is to be in plan a rectangle, not more than three times nor less than twice as long as it is broad. If the site oblige the length to be greater, the surplus is to be cut off to form what he calls chalcidica, by which must be meant open vestibules. The interior is divided into a central space and side aisles one-third the width of this. The ground plan of the basilica at Pompeii (fig. 1) illustrates this description, though the superstructure did not correspond to the Vitruvian scheme. The columns between nave and aisles, Vitruvius proceeds, are the same height as the width of the latter, and the aisle is covered with a flat roof forming a terrace (contignatio) on which people can walk. Surrounding this on the inner side is a breastwork or parapet (pluteum), which would conceal these promenaders from the view of the merchants in the basilica below. On the top of this parapet stood the upper row of columns, three-quarters as high as the lower ones. The spaces between these columns, above the top of the pluteum, would be left free for the admission of light to the central space, which was covered by a roof called by Vitruvius (v. 1. 6) mediana testudo. Nothing is said about a permanent tribunal or about an apse.

How far existing remains agree with the Vitruvian scheme will be seen as we proceed. We have now to consider the derivation of the word “basilica,” the history of the form of building, and its architectural scheme as represented in actual relics.

The word “basilica” is a Latinized form of the Greek adjective , “royal,” and some feminine substantive, such as domus, or stoa, must be understood with it. A certain building at Athens, wherein the  transacted business and the court of the Areopagus sometimes assembled, was called , and it is an accredited theory, though it is by no means proved, that we have here the origin of the later basilica. It is difficult to see why this was called “royal” except for some special but accidental reason such as can in this case be divined. There are other instances in which a term that becomes specific has been derived from some one specimen accidentally named. “Labyrinth” is one case in point, and “basilica” may be another. It is true that we do not know what was the shape of the King Archon’s portico, but the same name ( ) was given to the grand structure erected by Herod the Great along the southern edge of the Temple platform at Jerusalem, and this corresponded to the Vitruvian scheme of a columned fabric, with nave and aisles and clerestory lighting.

Whether the Roman basilicas, with which we are chiefly concerned, were derived directly from the Athenian example, or mediately from this through structures of the same kind erected in the later Greek cities, is hard to say. We should naturally look in that direction for the prototypes of the Roman basilicas, but as a fact we are not informed of any very early basilicas in these cities. The earliest we know of is the existing basilica at Pompeii, that may date back into the 2nd century, whereas basilicas made their appearance at Rome nearly at the beginning of that century. The first was erected by M. Porcius Cato, the censor, in 184, and was called after his name Basilica Porcia. Cato had recently visited Athens and had been struck by the beauty of the city, so that it is quite possible that the importation was direct.

Rome soon obtained other basilicas, of which the important Basilica Fulvia-Aemilia came next in point of time, till by the age of Augustus there were at least five in the immediate neighbourhood of the forum, the latest and most extensive being the Basilica Julia, which ran parallel to its southern side, and is shown in plan in fig. 2. The great Basilica Ulpia was built by Trajan in connexion with his forum about 112, and a fragment of the Capitoline plan of Rome gives the scheme of it (fig. 3), while an attempted restoration of the interior by Canina is shown in fig. 4. The vaulted basilica of Maxentius or Constantine on the Via Sacra dates from the beginning of the 4th century, and fig. 5 gives the section of it. The number of public basilicas we read of at Rome alone amounts to about a score, while many private basilicas, for business or recreation, must also have existed, that in the palace of Domitian on the Palatine being the best known. In provincial cities in Italy, and indeed all over the empire, basilicas were almost universal, and in the case of Italy we have proof of this as early as the date of the death of Augustus, for Suetonius (Aug. 100) tells us that the body of that emperor, when it was brought from Nola in Campania to Rome, rested “in basilica cujusque oppidi.” As regards existing examples, neither in the peninsula nor the provinces can it be said that these give any adequate idea of the former abundance and wide distribution of basilicas. Northern Africa contributes one or two examples, and a plan is given of that at Timgad (fig. 6). The Gallic basilicas, which must have been very numerous, are represented only by the noble structure at Trier (Trèves), which is now a single vast hall 180 ft. long, 90 ft. wide and 100 ft. high, commanded at one end by a spacious apse. There is reason to conjecture that this is the basilica erected by Constantine, and some authorities believe that originally it had internal colonnades. In England basilicas remain in part at Silchester (fig. 7), Uriconium (Wroxeter),