(Italian: Arco di Costantino) is a triumphal arch in Rome dedicated to the emperor Constantine the Great. The arch was commissioned by the Roman Senate to commemorate Constantine's victory over Maxentius at the Battle of Milvian Bridge in AD 312. Situated between the Colosseum and the Palatine Hill, the arch spans the Via Triumphalis, the route taken by victorious military leaders when they entered the city in a triumphal procession. Dedicated in 315, it is the largest Roman triumphal arch, with overall dimensions of 21 m (69 ft) high, 25.9 m (85 ft) wide and 7.4 m (24 ft) deep. It has three bays, the central one being 11.5 m (38 ft) high and 6.5 m (21 ft) wide and the laterals 7.4 m (24 ft) by 3.4 m (11 ft) each. The arch is constructed of brick-faced concrete covered in marble.
Arch of Constantine
The Arch of Constantine, Rome - painted by Herman van Swanevelt, 17th century
South side, from Via triumphalis. Colosseum to right
North side, from the Colosseum
A triumphal arch is a free-standing monumental structure in the shape of an archway with one or more arched passageways, often designed to span a road, and usually standing alone, unconnected to other buildings. In its simplest form, a triumphal arch consists of two massive piers connected by an arch, typically crowned with a flat entablature or attic on which a statue might be mounted or which bears commemorative inscriptions. The main structure is often decorated with carvings, sculpted reliefs, and dedications. More elaborate triumphal arches may have multiple archways, or in a tetrapylon, passages leading in four directions.
The Triumphal Arch of Orange in Orange, France, the oldest surviving triple-arched Roman triumphal arch, probably built during the reign of Emperor Augustus (27 BC–14 AD), later reconstructed by emperor Tiberius (c. 20–27 AD)
The Arc de Triomphe, Paris, begun by Napoleon in 1806
The Arch of Titus in Rome, an early Roman imperial triumphal arch with a single archway, built c. 81 AD by Emperor Domitian to commemorate his brother Titus's victory together with their father, Vespasian, over the Jewish rebellion in Judaea
The Arch of Septimius Severus at Leptis Magna, Libya, a four-arched arcus quadrifrons, built c. 203 AD