Arch of Constantine  

Arches were built to either celebrate a triumph or in memorial, it is one of the greatest inventions of Roman architecture. The largest and best preserved of Rome's triumphal arches "Arch of Constantine" was raised to celebrate Constantine's victory over his co-emperor Maxentius, in 312AD.

The Arch of Constantine was erected near the Colosseum, decorated with a series of relief's and sculptures taken from other buildings.

In 330 AD Constantine moved the Empire's capital to Byzantium, henceforth known as Constantinople, this event marked the end of classical, pagan Rome: from this time on the monuments of the former capital were gradually abandoned or converted to other purposes. It was the birth of a new Rome, Christian Rome.