City of Karlovac from the very beginning of the fortress end even before its creation was the intersection of traffic routes from Adriatic Sea to the interior. With creation of Karlovac fortress, it became the military stronghold of Military Border, along with the defense system consisted of smaller fortifications in the vicinity of the town of Karlovac, which date back to medieval times. At the parlament in Bruck an der Muri n March 1578., the idea of buolding a fortress was presented to the Croatian parlament and the nobility of Lower Austria. The place where tihe fortress was built was at the foot of the Dubovac fortress. From the very beginning of construction, problem of progress in the construction of fortress was the lack of manpower, lack of funds and floods that will mark tihe development of the fortress until the 18th century when modern construction eliminated the danger of floods. From very beginning the city of Karlovac was subject to foreign rule, from very beginning Austrian and Hungary ruled the territory of Karlovac, later they will be briefly replaced by the Franch government, but after that short period Austria came to power again. After the end of the Ottoman threat, Karlovac slowly became an important center of science, art, culture and literature, many important personaloties were born in tihe city such as Radosav Lopašić, Dragojla Jarnević, Vjekoslav Karas and many others. We could conclude that the city of Karlovac arose from the need to defend the border of Military Border, and later became a center of traffic, trade, culture and art.