Ostrovica is a small village named after a small river (tributary of the Una) in the Una-Sana Canton

Una-Sana Canton

The Una-Sana Canton is one of the 10 cantons of Bosnia and Herzegovina. It is located in the northwest of the country and has been named after the rivers Una and Sana. The center of canton government is Bihać.-Population:...

 of Bosnia and Herzegovina

Bosnia and Herzegovina

Bosnia and Herzegovina , sometimes called Bosnia-Herzegovina or simply Bosnia, is a country in Southern Europe, on the Balkan Peninsula. Bordered by Croatia to the north, west and south, Serbia to the east, and Montenegro to the southeast, Bosnia and Herzegovina is almost landlocked, except for the...

, located on a hill near the town of Kulen Vakuf

Kulen Vakuf

Kulen Vakuf is a village in the municipality of Bihać, Bosnia and Herzegovina. Kulen Vakuf was the birthplace of the respected Mehmed-beg Kulenović.-References:...

.

In the Middle Ages, Ostrovica was a fort, first mentioned in 1407 as a property of Sandalj Hranić, who in turn had received by marrying a woman from the House of Hrvatinić

House of Hrvatinic

Hrvatinić dynasty was a medieval Bosnian/Croatian noble house which ruled over various parts of Bosnia, Croatia and Dalmatia between the 13th century and the 15th century....

. He sold it to the Republic of Venice

Republic of Venice

The Republic of Venice or Venetian Republic was a state originating from the city of Venice in Northeastern Italy. It existed for over a millennium, from the late 7th century until 1797. It was formally known as the Most Serene Republic of Venice and is often referred to as La Serenissima, in...

 in 1411, who held it until it was taken by the Ottoman Empire

Ottoman Empire

The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

 in 1501. In 1737, the fort was unsuccessfully besieged by the army of the Habsburg Empire.