The portico, which stands at the top of a flight of 30 steps on the podium of the Roman temple, is of artistic interest. It contains six reused Classical columns with a
triumphal arch in the centre, surmounted by an ancient
entablature with mosaic decorations including the figures of a winged monster, an eagle, palms, deer, birds, bulls and other things. Beneath the portico are a funerary basin of the Roman age and pairs of beasts crouching to either side of the bases of the columns. A further 7 steps lead to the two entrances to the cathedral, of which the principal one is decorated with marble friezes of the
Augustan period. To the north of the portico is the
Romanesque campanile, curiously raised above ground level on four
pilasters. The interior has three naves separated by reused Roman columns, with side chapels. The two side naves terminate in
apses, while the central one (which also has an apse, dating from 1729), terminates in a quadrangular space occupied by the
choir. The
presbytery and the choir are about a metre higher than the three naves. The following features are of particular artistic interest: • the
Cosmatesque pavement of the central nave (12th-13th centuries) • the medieval
pulpit (first half of the 13th century), supported by five columns; • the spiral column, used to hold the Easter candle, of the mediaeval period; a marble inscription gives the maker and the date of the column: Crudele, 31 October 1245; • deacon and martyr, patron of Terracina|alt=the 18th-century frescoes of the presbytery and choir, depicting episodes from the election of Pope Urban II. ==External links==