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
Socialist Republic of Bosnia and Herzegovina divided among banovinas. When SR Bosnia and Herzegovina was formed, it included what were the territories of most of Vrbas Banovina, the western part of Drina Banovina, the northwestern part of Zeta Banovina, and the eastern parts of Banovina of Croatia. During a meeting of the State Anti-fascist Council for the National Liberation of Bosnia and Herzegovina (ZAVNOBiH) in Mrkonjić Grad on 25 November 1943. In April 1945 its name was formalized as the Federal State of Bosnia and Herzegovina ( / Федерална Држава Босна и Херцеговина), a constituent unit of the Democratic Federal Yugoslavia. With DF Yugoslavia changing its