"In hoc signo vinces" (Under this sign, you will conquer).
The Arch of Constantine was built to commemorate Emperor Constantine's victory over Maxentius at the Battle of Milvian Bridge in 312 AD. This battle was a pivotal moment in the history of the Roman Empire, as it led to Constantine's rise to power as the sole Roman Emperor.
Located in Rome, Italy, is indeed an important historical monument that symbolizes the relationship between the Church and the State, particularly in the context of the Roman Empire's transition to Christianity. While the arch itself doesn't represent this shift directly, it stands as a testament to the broader historical changes that were occurring during the reign of Emperor Constantine the Great.