   the principality of serbia or serbian principality () was an early medieval state of the serbs ruled by the vlastimiroviÄ dynasty, that existed from ca 768 to 969 in southeastern europe. it was established through an unification of several south slavic tribes under the supreme rule of viÅ¡eslav, the first known serbian ruler by name ( 768â814). in 822, the serbs were said to rule the "greater part of dalmatia", and at the same time the bulgars had taken the lands to the east, preparing to conquer serbia. vlastimir defeated the bulgar army in a three-year-war (839â842), and the two powers lived in peace for some decades. vlastimir's three sons succeeded in ruling serbia together, although not for long; serbia became a key part in the power struggle between the byzantines and bulgars (in predominantly byzantine alliance), which also resulted in major dynastic civil wars for a period of three decades. serbia was annexed by the bulgars for three years (924â927), until the return of the political hostage prince Äaslav, who united several p
10th-century_disestablishments 10th_century_in_Serbia 8th_century_in_Serbia 9th_century_in_Serbia Byzantine_Empire_successor_states_in_the_Balkans Former_Slavic_countries Former_countries_in_Europe Medieval_Serbia States_and_territories_disestablished_in_the_10th_century States_and_territories_established_in_the_8th_century