Klaić posited that there was no Slavic migration from North to South, but rather from South to North, as the Slavs were indigenous to the Balkan, therefore was no migration of the so-called White Croats from the White Croatia in Carantania. She supported the thesis by H. Kunstmann that Slavs did not have their own tribal names, and their names should be traced to the Illyrian, Greek and Byzantine cultural milieu. She believed the Croats were Slavs in the Avar Khaganate ruled by the Avars, and as such firmly considered that Croatian state organization and titles župan and ban were of Avar origin. She thought the discovered graves which dated from before the 9th century belonged to the Avars, not Croats, and that the Avars lived in Dalmatia.