Severans, as well as some other Slavic tribes and tribal groups, descended to the Panonian Plane as a vasals of the Avars. In the centuries after arrival of Magyars and establishment of the Hungarian medieval state, majority of Severans were absorbed into the Hungarian ethnical corpus with only some insulated pockets managing to preserve their original identity. These melted with the infux of Serbs and Croats from the south of Danube later in the 14th century, contributing to the origin of the today's Slavic population of the Voivodina (a northern province of Serbia), south-eastern Hungary and south-western Romania (Romanian part of Banat).