Croats of Bosnia and Herzegovina Dalmatian Croatia formed a united Croatian kingdom, which included Dalmatia and part of Bosnia and Herzegovina, Pannonia (eastern Slavonia and northeastern Bosnia), and Savia (western Slavonia). In 1102 Croatia entered into a union with the Kingdom of Hungary. After this, Bosnia, which was earlier part of the Kingdom of Croatia, started to disassociate with Croatia. At first, Bosnia became a separate principality under Ban Kulin who managed to solidify Bosnian autonomy at the expense of more powerful neighbours, but only in the 14th century did Bosnia become a formidable state. In the 14th century, King Tvrtko I conquered part of
Serbs of Bosnia and Herzegovina Muslim populace from all over the Balkans gradually settled the last pockets of Ottoman rule in the Balkans, one of which is Bosnia. In 1878, Bosnia and Herzegovina became a protectorate of Austria-Hungary, which the Serbs strongly opposed, even launching guerrilla operations against Austo-Hunagrian forces. Even after the fall of the Ottoman rule, the population of Bosnia and Herzegovina was divided. Serbian politicians in the Kingdom of Serbia and the Principality of Montenegro sought to annex Bosnia & Herzegovina into a unified Serbian state and that aspiration often caused political tension with Austria-Hungary. Another ambition of Serbian politicians was to