So, in the north – west of the city and now see the ruins Arrubium. Although the name is of Celtic origin, has not found any evidence showing the Celtic presence in the area.
Arrubium, whose ruins are situated in the city Macin is documented for the first time in around 100 AD, in two military diplomas.
Later, Roman camp there was also presented four other historical documents: Tabula Peutingeriana, the map drawn by an anonymous author, probably between 260-271 en; Itinerarium Antonini, written in the years 212-218 AD, as cast out dating from the time of Emperor Diocletian (284-305), which contains Roman city on the right bank of the Istra (Danube) from Turtucaia up flowing into the sea Black; Dignitatum Notitia, the first quarter of the fifth century, which contains a list of military and civilian functions in Eastern and Western Roman Empire; and Cosmograph, a description of the world done in the seventh century geographer from Ravenna.
Situated on a high promontory on the Danube, from one end of town Macin Arrubium was stationed where a number of military detachments and units of cavalry. A pillar of the Roman emperor Diocletian Millar proved rebuilding the road that connected the city to the other centers in the province. The Fortress ceased to function Urban VII century and in the centuries X – XI, on the promontory to set up an early medieval settlement.