Travunia
Travunia or Terbounia has been a vassalaged dependent part of Serbia. It was described as part of aentity called Red Croatia. Thus, it was inhabited by Red Croats or Serbs. In the middle of the 9th century, Grand Prince Vlastimir gave his daughter to marry Prince Krajina of Travunia, giving him full independence. Although, after that, Travunia became a direct part of Serbia. After the Serbian realm of Prince Časlav Klonimirović of Serbia crumbled in the second half of the 10th century, Travunia was directly incorporated into Duklja.
Read more about this topic: Medieval Dalmatian Principalities