Which arch celebrates the victory over Maxentius?

The Arch of Constantine is specifically dedicated to celebrating the victory of Emperor Constantine I over Maxentius at the Battle of Milvian Bridge in 312 AD. This monumental arch stands as a testament to Constantine's rise to power and serves not only as a victory monument but also as a symbol of his patronage over Christianity.

The arch is adorned with inscriptions and reliefs that narrate the significant aspects of his victory and the subsequent changes he made within the Roman Empire, particularly his support for the Christian faith. Its location near the Colosseum, a prominent site in ancient Rome, further emphasizes its importance in commemorating a pivotal moment in Roman history.

In contrast, the other arches listed serve different commemorative functions. The Arch of Augustus honors the victories of Augustus and celebrates his achievements as the first Roman Emperor. The Arch of Severus commemorates the victories of Emperor Septimius Severus in the Parthian campaigns. The Arch of Trajan celebrates Trajan's victories in Dacia. Each of these has its unique historical context, but none pertain to the specific victory over Maxentius like the Arch of Constantine does.