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
Greek Catholic Church of Croatia and Serbia Catholic Eparchy of Križevci had full jurisdiction over all Eastern Catholics of the Byzantine Rite throughout the entire territory of former Yugoslavia, including all of its successor states: Croatia, Slovenia, Bosnia-Herzegovina, Serbia, Montenegro and Macedonia. During that time, it mostly gathered its faithful among the Croats in central and eastern Croatia, among the Rusyns or Ukrainians in eastern Croatia, northern Bosnia and northern Serbia and among Macedonians in Macedonia. After the formation of independent successor states from what had been Yugoslavia, the process of administrative reorganization was initiated. In 2001, a separate Byzantine Catholic Apostolic Exarchate of Macedonia was formed