Museo Storico di Gradara
The Arch of Constantine spans the Via Triumphalis between the Colosseum and the Palatine Hill. Commissioned by the Roman Senate to commemorate Constantine’s victory over Maxentius at the Milvian Bridge in 312, it was dedicated in 315. It is the largest Roman triumphal arch: 21 metres high, 25.9 wide, with three bays. The central bay rises 11.5 metres; the laterals are lower. Brick-faced concrete clad in marble gives it solidity.
Much of the decoration was taken from earlier monuments. Reliefs from Trajan, Hadrian and Marcus Aurelius were reused, with Constantine’s portrait replacing the original emperors’ heads. This mixture of styles has sparked art-historical debate. The newly carved frieze is flatter, more geometric—a marked departure from the Hellenistic illusionism of the earlier pieces. Ernst Kitzinger called the contrast ‘violent’.
Controversy surrounds the arch’s origin. Some scholars argue it was originally erected under Hadrian and later reworked. Others suggest it was started by Maxentius and only completed by Constantine. A 1939 model by L’Orange and von Gerkan may have been influenced by Fascist Rome’s political climate. Recent work by Elizabeth Marlowe notes that the arch was shifted two metres east to align the view with the Colossus of Sol, hiding the Meta Sudans fountain.
The Arch of Constantine rises between the Colosseum and the Palatine Hill, straddling the ancient Via Triumphalis. Dedicated in AD 315 by the Roman Senate, it celebrated Constantine’s decennalia (ten years of rule) and his victory over Maxentius at the Milvian Bridge in 312. The Senate also marked the occasion with decennalia games, prayers and renewed vows. Constantine had entered Rome on 29 October 312; the Senate commissioned the arch soon after. He left Rome within two months and did not return until 326.
The arch is the largest Roman triumphal arch, measuring 21 metres high, 25.9 metres wide and 7.4 metres deep. It has three bays: the central one is 11.5 metres high and 6.5 metres wide, the laterals 7.4 by 3.4 metres. Constructed of brick-faced concrete and clad in marble, its three-bay design with detached columns follows the Arch of Septimius Severus in the Roman Forum, a pattern repeated in several now-lost arches.
For all its dedication to Constantine, much of the sculptural decoration is spolia. Reliefs and statues were removed from earlier triumphal monuments of Trajan (98–117), Hadrian (117–138) and Marcus Aurelius (161–180). The portrait heads were replaced with Constantine’s own. This reuse created a striking stylistic mix. Ernst Kitzinger compared a Hadrianic roundel of lion-hunting—‘still rooted firmly in the tradition of late Hellenistic art’ with an open, airy space—to the Constantinian frieze where figures are ‘pressed, trapped … so tightly packed … as to lack all freedom of movement’. The later figures are disposed geometrically, making sense only in relation to the spectator.
Controversy has long surrounded the arch’s origins. Some scholars claim it should no longer be called Constantine’s arch, arguing it is an earlier work from Hadrian’s time, reworked under Constantine (at least the lower part). Another theory holds that Maxentius erected or at least started it; one scholar believed it was as early as Domitian (81–96). Recent historiography also suggests that the influential model proposed by L’Orange and von Gerkan in 1939 may have been shaped by the Fascist political climate of 1930s Rome, when Mussolini promoted visual links between ancient and modern Rome.
Symbolism played a role. Maxentius had focused on restoring the capital—his epithet was conservator urbis suae. Constantine, by deposing a benefactor, needed legitimacy. He issued a damnatio memoriae, systematically erasing Maxentius’ memory. This leaves uncertainty about the patronage of early 4th-century public buildings: the arch may originally have been an Arch of Maxentius.
Modern scholarship examines how the arch functioned visually. Elizabeth Marlowe argues that the builders adjusted its position relative to the triumphal road and nearby monuments. It was set ‘not over the road but rather a bit further north’ and shifted ‘about 6½ feet (2 meters)’ east. As a result, ‘the tall cone of the fountain was almost completely hidden behind the arch’s second pier’, and the displacement ‘framed a different ancient monument: the (now-lost) colossal bronze statue of the sun god Sol’. The arch remains the most impressive surviving civic monument from Late Antiquity, yet also one of the most controversial in origins and meaning.
