Wikipedia
Vojnomir was a Slavic military commander in Frankish service. The Royal Frankish Annals makes mention of a Wonomyrus Sclavus (Vojnomir the Slav) active in 795. Eric of Friuli, sent Vojnomir with his army into Pannonia, between the Danube and Tisza, where they pillaged the Avars' dominions. According to Milko Kos they were not met with serious Avar resistance, and they conquered many forts. The next year the Avars were defeated and Frankish power was extended further east, to the central Danube. Vojnomir's leading position in the campaign has been presumed as very possible with regard to the textual analysis of Annales regni Francorum.
His origin and social position are not mentioned in any contemporary medieval source. His identity has been the subject of several hypotheses; that he was a prince or duke that held lands in either Slavonia, Carniola or Friuli, according to different hypotheses.