Croatian Parliament passed the 1567th The decision on the renewal and expansion of Koprivnica medieval fortress into a Renaissance lowland earthen fort as the next century, according to the latest military solutions protutopovske defense for North Italian and Dutch military builders and architects. The high earthen ramparts ravelins star-shape, curtain walls, bastions with moats filled with water stream Koprivnica served as an excellent protection of lowland city. It was the most modern and best equipped fortresses between the rivers Drava and Sava, and then its military significance is confirmed by the fact that the Koprivnica had a special place in Zrinski-Frankopan move 1671st year.
The spatial composition of the inner fortified city has been preserved to this day the basis of the historical urban core (street Oružanska, Vijećnićka, Duro Esther), and the preserved part of the southeast bastion with two corresponding ravelin and glasijom.