The ruins of several Early Croatian fortresses from the 14th century line the banks of the Krka River: Kamičk, Trošenj, Nečven, Bogočin and Ključica, one of the largest and most significant defensive structures in all of Croatia.
The territory between the Krka and Čikola Rivers, including Promin Mountain, was known as the Promin-Miljevac area in Croatian medieval history. During the Middle Ages, Croatian princes and noblemen erected magnificent fortress-cities here.
Today only ruins remain, with the occasional visible tower and wall, which still testify to their former greatness. The fortresses were erected at the edge of the Krka canyon, on both the left and right sides. As well as occasionally serving for defensive purposes, the fortresses also formed the core of individual settlements. The noble Croatian Šubić family built the fortresses Trošenj-grad (Čučevo) and Rogovo on the right bank of the river, while the fortresses on the left bank, Nečven, Bogočin and Kamičak were in the possession of other great Croatian families: Nelipić, Martinušić, Bogetić, Utješinović and Mišljenović. The Nelipić nobles owned what was by far the loveliest of all the fortresses, Ključica, which stood over the Čikola River canyon.