A fresh attempt to form an independent State was made by the Djoupan (Count) Vlastimir, who had succeeded in emancipating himself from Byzantine suzerainty. This province was called Rashka and extended around the Rivers Piva, Tara, and Lim, touching the basin of the River Ibar in the east and that of Vrbas in the west. But in the very beginning of its civil life there were dissensions amongst the leaders which facilitated the interference of the Bulgarian Tsar Siméon. Tchaslav, the djoupan of another Serbian tribe, though he possessed no rights to it, claimed the throne, and was supported by Siméon, who successfully invaded Rashka. The Bulgarians retained possession of the country for seven years (924-931), when Tchaslav succeeded in wresting from them a new state which comprised, together with Rashka, the territories of Zetta, Trebinye, Neretva and Houm. After his death, great disorder reigned in this principality.
In the course of the next century the Byzantine Empire, having again brought the now enfeebled Bulgaria within its rule, also overpowered Rashka, whose Grand Djoupan fled. The ruler of Zetta, Stephen Voïslav (1034-1051), son of Dragomir, djoupan of Trebinye, took the opportunity of declaring himself independent of his suzerain the Grand Djoupan of Rashka, and appropriated Zahoumlye (Herzegovina) and some other regions. His son Michaylo (1053-1081) succeeded further in bringing Rashka under his authority, and obtained the title of king (rex Sclavorum) from Pope Gregory VII in the year 1077. Under the rule of King Bodin, the son of Michaylo, the Serbia of Tchaslav was restored; furthermore Bosnia was added to his state. But after Bodin's death new disorder ensued, caused mainly by the struggles amongst the several pretenders to the throne.
Internecine strife is an unfortunate feature to be noticed throughout Serbian history, and constantly we see energy wasted in futile dissensions among various members of ruling families, who criminally and fatally neglected national interests, in pursuit by legitimate or illegitimate means of their personal ambitions. This has at all times hindered the Serbian nation from becoming a powerful political unit, although efforts were made by many of the rulers to realize this policy.