Roman buildings north of the Danube
Romans almost did not build any permanent camps (castrum), smaller fortifications and camps (castellum) or strongholds (arx) beyond the empire boundaries. An exception includes the Kelemantia citadel (today's Iža, Slovakia) built in the 70s of the 2nd century beyond the Danube empire boundaries, opposite the Brigetio legionary camp (I. Adiutrix legion). Another military point included Děvín in Slovakia, controlling the Morava river outlet to the Danube. The structure of these fortifications has all the characteristic features of similar objects on the limit.
In addition to the military installation, there are some foundations of buildings north of the Danube built in a Roman manner. They are objects the Romans built and used by themselves such as the trading post near Stupava (Slovakia) or related to German settlements. We can presume they were stately homes of the German aristocracy. We know of some buildings in Slovakia: Cífer-Pác, Bratislava-Dúbravka and Velký Kýr (formerly Milanovce). In the territory of Moravia, brick architecture is documented indirectly by the building material – bricks and roof tiles. Fractions of these materials have been found during archaeological researches in Staré Město near Uherské Hradiště, Mikulčice and Pohansko near Břeclav in the context of Great Moravian religious buildings. In Olomouc, it is in the place of expected religious buildings from the 10th or 11th century (Church of our Lady of the Snow, Theresian Armoury). The building material is expected to come from Roman objects not localised so far.