The Costoboci, coming from the Carpathian area, invaded Moesia, Macedonia, and Greece. After a long struggle, Marcus managed to push back the invaders. Numerous members of Germanic tribes settled in frontier regions like Dacia, Pannonia, Germany, and Italy itself. This was not a new thing, but this time the numbers of settlers required the creation of two new frontier provinces on the left shore of the Danube, Sarmatia and Marcomannia, including today's Czechia, Slovakia, and Hungary. Some Germanic tribes who settled in Ravenna revolted and managed to seize possession of the city. For this reason, Marcus decided not only against bringing more barbarians into Italy, but even banished those who had previously been brought there.