Gate (Olomouc-Neředín, Hulín-Pravčice, Osek) have been partly corroborated, the former two clearly by digging. Marcus Aurelius wanted to create a new Roman province called Marcomannia in those conquered territories, but his death put an end to the project. His successors abandoned these territories, but – with the exception of Valentinian I – maintained a relatively friendly relationship with the barbarians living there (who enjoyed a degree of "cultural Romanization" that can be seen in some buildings in present-day Bratislava Region in Stupava). Indeed, the Romanization of the barbarian population continued into the late Roman period (181-380 AD). Many Roman buildings (with plenty of trade evidence of Roman civilization) appeared on the territory of south-western Slovakia (Dúbravka, Cífer - Pác, Veľký Kýr) in the relatively peaceful period of the 3rd and 4th centuries. These were probably residences of the pro-Roman Quadian (and maybe Marcomannic) aristocracy. Romans in the late fourth century were able to bring Christianity into the area: the Germanic population of the Marcomanni converted when Fritigil, their queen, met a Christian traveller from the Roman Empire shortly before 397 AD. He talked to her of Ambrose, the formidable bishop of Milan (Italy). Impressed by what she heard, the queen converted to Christianity. In the Roman ruins of Devín Castle, the first Christian church located north of the Danube has been identified, probably built in the early fifth century. A few years later Attila devastated the area and started the mass migrations that destroyed the Western Roman Empire. Meanwhile, the area was beginning to be occupied by Slavic tribes. Indeed, the first written source suggesting that Slavic tribes established themselves in what is now Slovakia is connected to the migration of the Germanic Heruli from the Middle Danube region towards Scandinavia in 512. In that year, according to Procopius, they first passed "through the land of the Slavs", most probably along the river Morava. A cluster of archaeological sites in the valleys of the rivers Morava, Váh and Hron also suggests that at the latest the earliest Slavic settlements appeared in the territory around 500 AD. They are characterized by vessels similar to those of the "Mogiła" group of southern Poland and having analogies in the "Korchak" pottery of Ukraine. In those same years the Roman presence disappeared from the area of Danubian limes, but there is a remote possibility that Romans and those early Slovak tribes interacted commercially. Background