|The Arch of Constantine in Rome. Situated between the Palatine Hill and the Colosseum, the triumphal arch was dedicated in 315 to commemorate the Emperor's victory over Maxentius at the Battle of the Milivian Bridge|
Photo by New York Scugnizzo
On October 28, 312 AD Emperor Constantine the Great defeated the usurper Maxentius at the Battle of the Milvian Bridge. The victory definitively ended the Roman Empire’s period of Tetrarchy (leadership of four people) established by Diocletion in 293 and set the stage for Constantine’s eventual ascension to sole rule of the empire.