东罗马文献中北巴尔干的诸族基本都只是一般的蛮族,有时这些蛮族会在罗马人影响下改信正教,但是并不改变东罗马人对他们整体的态度。De Administrando Imperio的作者(可能是君七也可能是其宫里的枪手)基本上就把塞尔维亚人诸部当作罗马人的仆从,作为对抗保加利亚人的资源:
That the leader of Serbia was, from the start, or rather since the reign of Herakleios the King, has been subordinated in a servile manner to the King of the Romans, and was never subordinate to the leader of Bulgaria.
只挑了一段出来。全文可以自己找Doaks出的De Administrando Imperio的原文+翻译,网上有pdf.