THE CAPITAL OF ROMAN SCULPTURE
Given that Roman civilization was essentially urban, architectural sculpture was the bread and butter of the specialized stone—cutting workshops active in most towns of the Empire. Buildings were decorated with geometrical and foliage patterns carved in the stonework of friezes, entablatures, cornices and capitals. The latter were used to crown columns and pillars and bear the weight of architrave or springer. A capital consisted of a cushion (the echinus) surmounted by a plain or decorated block of greater or lesser thickness (the abacus) and was linked to the shaft of the column below by a number of mouldings. It was the member that most readily distinguished the architectural orders, even more so than the column or entablature. The Romans continued to use the three types of Greek capital — Done, Ionic and Corinthian and created the Tuscan, which had a fillet above the abacus and an astragal, or smooth moulding, round the neck of the column on which it sat. The composite capital was a mixture of the Ionic and Corinthian, sometimes decorated with winged victories or eagles. This type was probably developed in the time of Augustus, and the most elaborate examples so Rome itself are those gracing the Arch of Titus; the capitals of the Colosseum are probably not original. The fact that these capitals have two registers of acanthus leaves shows the predominance of the Corinthian order. In Southern Italy, the end of the Republican era, around 30 BC, seems the most propitious moment for the invention of these capitals. At Pompeii, the capitals of the great palaestra or the house of Octavius Quartio are proof of experimentation in this direction.
Whilst drawing inspiration from their Greek heritage, the Romans rethought it completely. In the area of decorative sculpture, the Corinthian order was the most widely used. The oldest building with Corinthian columns on the exterior is the monument to Lysicrates in Athens, which dates from around BC. But the history of the Corinthian capital as a form dates back even further, probably to the late fifth century. Hellenistic architects often hesitated to use Corinthian capitals in conjunction with the Ionic or Done orders. But despite its ancient history, the Corinthian was the preferred Roman order. The buildings now accepted as the starting point of Roman Corinthian date from the period between the death of Julius Caesar and approximately 25 BC. Three of these structures are widely known for their architectural features: the temple to Julius Caesar in the Roman Forum (42—29 BC), the Regia restored by Domitius Calvinus around 36 BC, and the Augustan Temple of Apollo on the Palatine, begun in 36 and dedicated in 28 BC. The first and third of these are Corinthian buildings with well- preserved capitals. The entablature of the Regia consisted of au architrave divided into two horizontal bands and crowned with a plain moulding. The continuous frieze was decorated with garlanded ox-skulls or bucrania. The cornice had dentils and modillions below the corona, while the flat surfaces between the modillions were decorated with low-relief floral motifs. A fourth building, the Temple of Saturn (about 20 BC), should be mentioned as well in this context, as it was almost certainly Corinthian in style when built. In all these buildings, the presence of modillions arranged at regular intervals below a projecting corona is an essential feature, hallmark of the origins of Roman Corinthian. The history of architectural decoration after the Battle of Actium (31 BC) and throughout the Augustan period is marked by a departure from the purity of the Classical orders and a taste for opulence and variety of detail. This light-hearted approach signalled the beginnings of the Roman style, as witnessed by the triumphal arch at Rimini, erected on the Via Flaminia in 27 BC. Of the different types of Roman capital, those sculpted with human figures are highly characteristic. Their origins can be traced back to Classical and Hellenistic Greece, and they became extremely popular in Southern Italy in the fourth century BC. They were subsequently taken up by Roman artists and produced in a great variety of forms: as portrait—bases in Provence, sculpted with the foreparts of animals (pro- tomes) in the Temple of Mars Ultor, and carved with continuous reliefs in the so—called Antonine baths in Carthage. Some of these capitals are of the highest quality, deserving of a place alongside statues and reliefs in the history of Roman sculpture. The capital in the Pigna Courtyard in the Vatican comes from the city baths built by Severus Alexander around 227 AD. It is carved with sporting scenes featuring a boxer, a gymnast and others.
During Late Antiquity, the capital underwent a transformation, in common with other elements of architectural decoration. The Theodosian capital is composite, with a double row of eight spiny acanthus leaves and, above, between the volutes, a row of upright leaves with five lobes replacing the Classical ovolo design. Below is a wreath of oblique spiny acanthus. This model was certainly created in the workshops of Constantinople and is the precursor of the various types of Byzantine capital. In some cases, their Christian character is indicated by the symbol of a cross.