The Arch of Trajan in Ancona is a Roman Triumphal arch erected by the Senate and people of Rome in the reign of Emperor Trajan. It was built in honour of that Emperor after he expanded the port of the city out of his own pocket, improving the docks and the fortifications. It was from here that Trajan departed for the ultimately successful war against the Dacians, an episode which is commemorated in the bas relief of Trajan's column in Rome.