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
Flag of Bosnia and Herzegovina The original medieval coat of arms had a white background and two red stripes in the top of the shield. As the entire territory of modern Bosnia and Herzegovina was part of the Independent State of Croatia, a puppet state of Nazi Germany during World War II, the flag is similar to the flag of Croatia, which consisted of a tricolor of red-white-blue with the chequy in the centre and the letter "U" at the top left of the flag. Whilst being the Socialist Republic of Bosnia and Herzegovina within communist Yugoslavia, the Yugoslav flag stood as a canton, while