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 Montenegro took advantage of this weakness and attacked the Ottoman Empire in 1876, soon after the Russian Empire did the same. The Turks lost the war in 1878. After the Congress of Berlin was held in same year, mandate of Bosnia and Herzegovina was transferred to the Austro-Hungarian Empire. More specifically, In 1875, the Herzegovina Uprising broke out in the Bosnia Vilayet. On July 2, 1876, Golub Babić and his 71 commanders signed the "Proclamation of the Unification of Bosnia with Serbia". This event is often known, among Serbian historians, as the "Third Serbian Uprising". This rebellion directly led to