Kozarska Dubica (), previously known as Bosanska Dubica () is a town and municipality located in northern Republika Srpska, an entity of Bosnia and Herzegovina. As of 2013, it has a population of 21,542 inhabitants, while the town of Kozarska Dubica has a population of 11,566 inhabitants. Geography It is situated in the eastern part of Bosanska Krajina region. The municipality of Hrvatska Dubica lies to the north, in Croatia. Bosanska Dubica is situated from the Zagreb–Belgrade highway. The town and its suburbs border Croatia to the north, the town of Gradiška to the east, the town of Kostajnica to the west, and the town of Prijedor to the south. The land area of Bosanska Dubica is . Name The town was originally known as "Bosanska Dubica" (Босанска Дубица in Serbian Cyrillic, literally "Bosnian Dubica") but was renamed "Kozarska Dubica" (Козарска Дубица in Serbian Cyrillic) by the authorities of Republika Srpska following the Bosnian War, which was part of a broad political resolution to remove all Bosnian prefixes. This included towns like Gradiška (Bosanska Gradiška) and Novi Grad (Bosanski Novi). History Early history Kozarska Dubica was built in 930. Dubica on the right bank of the Una it was first mentioned in 1258 as Castrum. It was the seat of the Dubica county of the Kingdom of Hungary. In 1538 Dubica came under Ottoman rule Babonići-Vodički were in charge of the town until the 12th century. Kozarska Dubica became an important fort during the Ottoman Empire due to its geographic positioning. It became a vital and important border crossing for many years. The last Austrian-Turkish war was the so-called Dubica War (1788–91) and was fought in this area. During the war in Kozarska Dubica in the 1780s, the town, which was described at the time as having only a few houses and a mosque, was completely razed. The town fell under Ottoman occupation in 1538. Kozarska Dubica encountered many different rulers during the Ottoman Empire and the later Austro-Hungarian Empire. During World War II, the town was occupied by Axis troops and was included into the Pavelić's Independent State of Croatia (NDH). The fascist Ustashe regime committed the Genocide of the Serbs and the Holocaust. During the war, the NDH armed forces killed over 7,000 Serbs in the municipality of Kozarska Dubica, while the municipality lost more than half of its pre-war population. The biggest massacre was committed by the