The Arch of Galerius is a monumental structure located in Thessaloniki, Greece. Built around 303 AD, it was erected to commemorate the Roman Emperor Galerius and his victories, particularly against the Persians. The arch features intricate reliefs that depict various scenes from Galerius's military campaigns and is a significant example of Roman architecture. This arch originally served as a gateway to the imperial palace of Galerius, connecting it to the city. Today, it stands as a historical landmark, showcasing the artistic and architectural achievements of the Roman Empire. The arch is part of a larger complex that includes the Rotunda and other ancient structures.