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
Bosnia and Herzegovina abandoned the central parliament in Sarajevo, and formed the Assembly of the Serb People of Bosnia and Herzegovina on 24 October 1991, which marked the end of the tri-ethnic coalition that governed after the elections in 1990. This Assembly established the Serbian Republic of Bosnia and Herzegovina on 9 January 1992, which was renamed Republika Srpska in August 1992. On 18 November 1991, the party branch in Bosnia and Herzegovina of the ruling party in the Republic of Croatia, the Croatian Democratic Union (HDZ), proclaimed the existence of the Croatian Community of Herzeg-Bosnia, with the Croatian Defence Council (HVO) as