Budapest, Italy
It is called Contra-Aquincum because it is opposite the Roman town on the western side which is known as Aquincum. It was a Roman fort, an important station in the Pannonian limes. It is built around in 100, rebuilt in 290. Its significance is: unusually thick walls, control of the eravisk (a Celtic
local folk group) "capital" and control of crossing an ancient trading port. Contra-Aquincum ancient name was presumably Pesszion (Πέσσιον). You can see here some plaque on the floor, about Roman forts in/around Budapest and Pannonia (this last one was an ancient province of the Roman Empire and located over the territory of the present-day western Hungary).
Listen to the audio guide for Contra-Aquincum Free on WIP — starts by itself when you arrive, even with the screen off