Thanks to the soil fertility and perennial availability of drinking water, the terrain of today’s Municipality of Kozarska Dubica was settled as early as in the pre-historical period, which is evidenced by the presence of numerous archeological sites. After the Fall of Roman Empire, the space between the rivers of Una and Vrbas was settled by Slavic tribes. Namely, in Proto-Slavic language „dub“ means Oak Tree. The regions were covered by vast commonnoak forest, which the community takes its name after.