In the Doric architecture of the ground story, the usual magnificence of this order is wanting; the columns being merely surmounted by what is termed "an architrave cornice," with the mutiles; while the frieze, with its rich triglyphs and metopes is altogether omitted.

The inscription on both sides of the architrave imports, that it was dedicated "to the Emperor Cæsar Flavius Constantine Augustus, the greatest, pious, and the happy; because by a divine impulse, the greatness of his courage, and the aid of his army, he avenged the republic by his just arms, and, at the same time, rescued it from the tyrant and his whole faction."