Vladislav Hercegović from the House of Kosača was a Medieval ruler of Herzegovina

Herzegovina

Herzegovina is the southern region of Bosnia and Herzegovina. While there is no official border distinguishing it from the Bosnian region, it is generally accepted that the borders of the region are Croatia to the west, Montenegro to the south, the canton boundaries of the Herzegovina-Neretva...

. In the year 1466 he succeeded his father Stjepan Vukčić, receiving his lands and the title of Herzog

Herzog (name)

Herzog is a German hereditary title held by one who rules a territorial duchy, exercises feudal authority over an estate called a duchy, or possesses a right, by law or tradition, to be referred to by the ducal title. The word is usually translated by the English duke and the Latin Dux. Generally,...

 of Saint Sava

Saint Sava

Saint Sava was a Serbian Prince and Orthodox monk, the first Archbishop of the autocephalous Serbian Church, the founder of Serbian law and literature, and a diplomat. Sava was born Rastko Nemanjić , the youngest son of Serbian Grand Župan Stefan Nemanja , and ruled the appanage of Hum briefly in...

. During his father's reign he is known to have interfered with his affairs. After 1453 he was frequently in the service of 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...

, 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...

 and the Hungarian

Hungary

Hungary , officially the Republic of Hungary , is a landlocked country in Central Europe. It is situated in the Carpathian Basin and is bordered by Slovakia to the north, Ukraine and Romania to the east, Serbia and Croatia to the south, Slovenia to the southwest and Austria to the west. The...

-Croatia

Croatia

Croatia , officially the Republic of Croatia , is a unitary democratic parliamentary republic in Europe at the crossroads of the Mitteleuropa, the Balkans, and the Mediterranean. Its capital and largest city is Zagreb. The country is divided into 20 counties and the city of Zagreb. Croatia covers ...

n king Matthias Corvinus

Matthias Corvinus of Hungary

Matthias Corvinus , also called the Just in folk tales, was King of Hungary and Croatia from 1458, at the age of 14 until his death...

. Corvinus granted him the forts of Velika Kalnik and Mali Kalnik near Križevci.

As an Ottoman vasal (after 1469) he took part in the capture of the town of Počitelj

Počitelj

Počitelj may refer to:*Počitelj, Bosnia and Herzegovina, a village near Čapljina, Bosnia and Herzegovina*Počitelj, Croatia, a hamlet near Gospić, Croatia...

 on the river Neretva

Neretva

Neretva is the largest river of the eastern part of the Adriatic basin. It has been harnessed and controlled to a large extent by four HE power-plants with large dams and their storage lakes, but it is still recognized for its natural beauty, diversity of its landscape and visual...

 in 1472 and in battles against the Vlatković's of that region. He succeeded in escaping Ottoman rule until 1480 when he was defeated and retreated to Herceg Novi

Herceg Novi

Herceg Novi is a coastal town in Montenegro located at the entrance to the Bay of Kotor and at the foot of Mount Orjen. It is the administrative center of the Herceg Novi Municipality with around 33,000 inhabitants...

. When Herceg Novi was captured by the Ottomans in the year 1483 Vladislav retreated to the island of Rab

Rab

Rab is an island in Croatia and a town of the same name located just off the northern Croatian coast in the Adriatic Sea.The island is long, has an area of and 9,480 inhabitants . The highest peak is Kamenjak at 408 meters...

 under Venetian rule where he eventually died. His son Balša lived at Kalnik where he is mentioned until 1510. After his death, the once powerful family was reduced to poverty.