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You are along the route: IN HOC SIGNO VINCES. CONSTANTINE CHRISTIAN EMPEROR
Via di San Gregorio
To commemorate the victory of Constantine over his rival Maxentius (312 AD), the Senate built a triumphal arch with three openings in 315.
25 metres high, this is the largest preserved in Rome. On the long sides of the attic is an inscription commemorating the triumph and defining Maxentius as a tyrant. The marble of the monument had been, for technical and economic reasons, recycled from older buildings that had either never been completed or were in ruins, and in which the faces of previous emperors, such as Hadrian, were remodelled to resemble the features of Constantine. The historic frieze running above the side arches and continuing on the short sides of the monument and recounting the war of Constantine against Maxentius and the subsequent celebrations in Rome was of new construction.
Eight statues, placed on the top, of Dacians, the barbarians tamed by Emperor Trajan over 200 years earlier, had been removed from the decoration of Trajan’s Forum, one of the Imperial Forums.