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–Croatia relations since 2003, and is used without hindrance by either party. The Herzegovinian municipality of Neum in the south makes the southernmost part of Croatia (Dubrovnik–Neretva County) an exclave. In 1999, a border agreement between former Croatian President Franjo Tuđman and President of Bosnia and Herzegovina Alija Izetbegović moved the Croatia – Bosnia and Herzegovina border near Neum from the very coast (during SFR Yugoslavia era and confirmed by the Badinter Arbitration Committee) further into the sea waters of the Mali Ston Bay, placing two Croatian islands (Mali and Veliki Škoj, incidentally translated into English as "Little" and "Big Island") under