There are three rows of reliefs: The top row panel on the north and south main façades is a sculpture of arms, and on the east and west smaller façades, the reliefs represent trophies of arms; on the middle row, the panels depict naval scenes; and the bottom larger panels depict battle scenes.

It is believed that the Triumphal Arch at Orange was used as a model for the Arches in Rome dedicated to Septimus Severus and Constantine.

Information sources:

Unesco World Heritage Sites
Athena Review
Heritage Key