The Arch of Constantine is a triumphal arch in Rome located between the Coliseum and the Palatine Hill erected to commemorate Emperor Constantine I's victory over Maxentius, who was the Emperor of the Western portion of the Roman Empire, at the Battle of Milvian Bridge.

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Constantine's victory over Maxentius led to the end of the of the Tetrarchy, which is a system of government where power is shared by four individuals, usually referring to the tetrarchy instituted in 293 C.E. in the Roman Empire and until the dissolution in c313 when Constantine became the sole ruler.

The photograph above was taken from the Colosseum and in the distance behind the Arch of Constantine is the Palatine Hill. , below is a detail of Constantine's Arch.

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