The Arch of Constantine is located between the Arch of Titus and the Circus Maximus, along the road where the Triumphal Parades passed. It is the largest honorary arch still existing and the last great political monument of the city.

It was dedicated to Constantine by the Senate in 315 AD to commemorate his victory over Maxentius in the battle of the Milvian Bridge which took place 3 years earlier. Reliefs from monuments erected by Trajan, Hadrian and Marcus Aurelius were used in the decoration of this Arch. This choice of materials to adorn a monument with a clear symbolic significance was not fortuitous.