Only the northwestern three of the eight pillars and parts of the masonry cores of the arches above survive: i.e., the entire eastern side (four pillars) and the southernmost one of the western pillars are lost.[3] Extensive consolidation with modern brick has been performed on the exposed masonry cores to protect the monument. The two pillars flanking the central arched passageway retain their sculpted marble slabs, which depict the wars of Galerius against the Persians in broadly panegyric terms.