 With the annexation of "Rascia", the previous crownland and seat of Serbia, the county around the city of Doclea emerges into a Principality, where the leaders adopt the title "archon of Serbs" (signifying supreme leadership among Serbs) alongside their given offices under Byzantine overlordship.The first office-holder was Peter of Diokleia, of which we only have a seal found in the 19th century.The next known is Jovan Vladimir, who became a Bulgarian vassal.