The building is oriented almost perfectly towards the south, differing from the orientation of the other neighbouring buildings, including the adjoining
temple of Bellona. The
Augustan phase of the temple was made up of a podium under the columns and the
cella walls, with its supporting parts made up of
travertine blocks to carry the weight and the non-supporting parts merely of
tuff blocks and cement. The remains of the podium wall surviving beneath the cloisters of
Santa Maria in Campitelli – 13 metres long, over 4 high and over 2 thick – were assumed by
Delbrück to be unquestionably a part of the original structure. Frank, however, maintains that though the
cappellaccio tuff core may belong to the original building, the rest (besides some concrete with an
opus reticulatum facing, attributable to the 34 BC phase) belongs to the 179 BC restoration. He argues this from the use in the remains' facing of tuff from Monte Verde, the southern end of the
Janiculum Hill. The temple's
hexastyle elevation was formed of
Carrara marble columns along the front and the two long sides of the
pronaos, with those at the back made of plastered brick. This style was continued in travertine half-columns (plastered to look like marble) against the cella walls. The facade's architrave was made up of blocks of travertine faced and supported with marble in the
pittabanda style, rather than solid blocks of marble alone. In the same way the frieze was sculpted on slabs placed on the supporting structure. The capitals are
Corinthian with extra vegetable motifs (in Italian, "
corinzieggiante", no English equivalent), and the frame presents a very protruding ceiling supported by brackets. The temple's main pediment was decorated with sculptures removed from a classical temple in Greece. These date to c. 450 - 425 BC and show an
amazonomachy. They are now preserved at Centrale Montemartini of the
Capitoline Museums. The cella's interior walls were decorated with a double order of column shafts in African marble, the lower one with a frieze representing stages of the battles included in the triple triumph of Octavian in 29 BC. Between the columns were
aediculae with column-shafts in different coloured marbles (
giallo antico, pavonazzetto and portasanta) and with
tympana in unusual shapes (triangular, half-moon and 'pagoda'-form triangular).
Art-historical analysis The architectural decoration of the surviving phase includes different and unusual motifs (e.g. the grooves of the column trunks, which are not all equal, but alternately wider and narrower). This shows a moment at which a new decorative style is being elaborated, amalgamating the
Italic architectural style of the Republic (as shown, for example, in the
Temple of Portunus) with the influences of the Hellenistic Greek East, emphasizing the old values of Augustus's new status quo whilst showing the regime's innovative cultural credentials. This style would later be codified in the
Forum of Augustus. Other new features include the insertion of decorative elements meant to celebrate Octavian, such as the laurel in the frieze and capitals. The temple also dates from the earliest period in which marble was used in bulk for Roman public buildings, and represents a switch-over period from the traditional technologies of plastered tuff and travertine, with experimentation in ways of working with the new materials. Indeed, marble is only used on the facade, with the architects as yet uncertain of its load-bearing possibilities, as seen in the faced tuff frieze, lintel and capitals. ==Other buildings in the area==