Constantine's victory at the battle of the milvian bridge is commemorated by which famous roman monument?

The correct answer is the Arch of Constantine

It is a triumphal gate found near the Colosseum in Rome and is the largest triumphal arch that can be found in Rome. Ever since it was built, Roman emperors would lead their armies through it and through the street as a form of celebration for their military triumphs. As other emperors won their battles, they added new things like carvings onto the arch.