Yeah i didnt want to go into details. I just wanted to point out that all ancient "republics" were not republics in modern sence. Common folks didnt have much saying in politics. Slavic people had their Knezi, Boyars, etc. In Carantania and possibily Carniola it was like this;
Common folks = no role in politics (maybe on local level?).
Kosezi = voting class.
Knez = elected by Kosezi class. Knez was probably member of some kind of plemstvo.