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 of Yugoslavia, the Serbian Autonomous Area of the Bosnian Frontier was formed in the western Bosnian Frontier region of Bosnia and Herzegovina with its capital in Banja Luka, which was not recognised by the central government. SAO Bosnian Frontier made attempts to unite with the Autonomous Region of the Serbian Frontier in Croatia. The Serb political leadership martialled its own force assisted by the Yugoslav People's Army and declared independence from Bosnia and Herzegovina in late 1992. BiH's Bosniak and Bosnian Croat dominated government did not recognize the new Serbian Republic of Bosnia and Herzegovina, whose president was Radovan Karadžić