Constantine Triumph, built in 315 A.D., is the latest of the three existing triumph gates in Rome. It was built to celebrate Constantine's complete defeat of his powerful enemy, Maxenti, in 312 A.D., and the reunification of the empire. Most of the ornaments above the arch are actually from buildings built by former emperors. The carvings of the important periods of the Roman Empire preserved on it are a vivid history of Roman carvings. The Arc de Triomphe is right next to the Colosseum. Visiting the Colosseum, you will see the Arc de Triomphe.