Kostajnica Fortress
Introduction


**Kostajnica Fortress** is a castle in [Hrvatska Kostajnica](/wiki/Hrvatska_Kostajnica "Hrvatska Kostajnica"), a town in central [Croatia](/wiki/Croatia "Croatia"), near the border to [Bosnia and Herzegovina](/wiki/Bosnia_and_Herzegovina "Bosnia and Herzegovina").

The fortress was built most probably in the 14th century and owned by the members of the noble families [Frankopan](/wiki/Frankopan "Frankopan"), Lipovečki, Tot, Benvenjud and finally (in the 16th century) [Zrinski](/wiki/Zrinski "Zrinski"), so it is today also known as "Zrinski fortress" or "Zrinski castle" (). It was conquered by the [Ottomans](/wiki/Ottoman_Empire "Ottoman Empire") on 17 July 1556, remaining under Ottoman rule until 1688\.

Situated on the banks of the [river Una](/wiki/Una_%28Sava%29 "Una (Sava)"), the fortress has very strong walls and three towers. Having been in a state of disrepair before, it has been renewed in recent years by the [Croatian Ministry of Culture](/wiki/Ministry_of_Culture_%28Croatia%29 "Ministry of Culture (Croatia)").


Which noble families owned Kostajnica Fortress?