 Some other Suevi, had already formed into a new confederation known as the Alamanni, who moved into the area of modern "Suebia" in southwestern Germany, a territory that the Romans had previously had some control of, and referred to as the "Agri Decumates".They formed a buffer zone on the Roman border on the Rhine, around which the migrating groups needed to pass.In the area of the Danube and Pannonia, "Suevi" was later also the name given to one of the successor kingdoms which arose after the collapse of the empire of Attila the Hun, in whose empire they had apparently been subsumed.