The most impressive triumphal arch in Rome is the arch of Constantine, built between 312 and 315 CE to commemorate Constantine’s victory over Maxentius at the Milvian Bridge of Rome (though there are other theories; it may have been begun by Maxentius). But the famous emperor cheated; he stole many relief sculptures from monuments built by earlier emperors such as Trajan, Hadrian, and Marcus Aurelius. Very little of the sculpture, in fact, was produced in Constantine’s own age, and they’re the smallest and less technically accomplished pieces . It’s one of the great re-uses of the art of the past and an eloquent example of how Roman emperors were happy to aggrandize themselves at the expense of their predecessors. It’s overall design, though, is good, despite the pastiche quality and the collage of earlier fragments. It’s huge, but it’s location next to the Coliseum makes it appear just a bit smaller than it otherwise might.