The Arch of Constantine, Rome.<BR>A triumphal arch, erected about 315 AD to commemorate the triumph of Constantine I after his victory over Maxentius in the battle at the Milvian Bridge in 312 AD. The arch is located in the valley of the Colosseum, between the Palatine Hill and the Colosseum, along the road taken by the triumphal processions.The arch is the largest of only three such arches to survive in Rome today. The two others are the Arch of Titus and the Arch of Septimius Severus, both in the nearby Forum Romanum.