Vuk Kosača was a 14th-century military commander (voivode) of Dušan the Mighty, the Emperor of Serbia

Serbian Empire

The Serbian Empire was a short-lived medieval empire in the Balkans that emerged from the Serbian Kingdom. Stephen Uroš IV Dušan was crowned Emperor of Serbs and Greeks on 16 April, 1346, a title signifying a successorship to the Eastern Roman Empire...

 (r. 1331-1355). He is the founding father of a medieval Herzegovinian

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...

 noble family known as the Kosačas

House of Kosaca

The House of Kosača was a medieval Bosnian noble family which ruled over various parts of Bosnia, Croatia and Dalmatia between the 14th century and the 15th century. The land they controlled was mostly known as Hum or Zahumlje...

, that would later rule a semi-independent realm under the Bosnian crown. His lands were located left of the Drina, around Rogatica

Rogatica

Rogatica is a municipality and town in eastern Bosnia and Herzegovina located 60 kilometres northeast of Sarajevo; midway on the road from Goražde towards Sokolac...

.

Vuk was a military commander in the army of Tsar Dušan the Mighty

Stefan Uroš IV Dušan of Serbia

Stephen Uroš IV Dušan the Mighty , was the King of Serbia and Emperor of the Serbs and Greeks until his death on 20 December 1355. Dušan managed to conquer a large part of Southeast Europe, becoming one of the most powerful monarchs in his time...

 during the campaigns in the southern Balkans

Balkans

The Balkans is a geopolitical and cultural region of southeastern Europe...

 in the late 1340s, in specific Epirus

Epirus

The name Epirus, from the Greek "Ήπειρος" meaning continent may refer to:-Geographical:* Epirus - a historical and geographical region of the southwestern Balkans, straddling modern Greece and Albania...

 and Thessaly

Thessaly

Thessaly is a traditional geographical region and an administrative region of Greece, comprising most of the ancient region of the same name. Before the Greek Dark Ages, Thessaly was known as Aeolia, and appears thus in Homer's Odyssey....

.

According to Mavro Orbini

Mavro Orbini

Mavro Orbin was a writer, ideologue and historian from the Republic of Ragusa...

, during a hunt in northern Serbia, he accidentally killed Branko Rastislalić

Branko Rastislalić

Branko Rastislalić was the "Lord of Podunavlje" and Domestikos under Dušan the Mighty of the Serbian Empire from circa 1340 until his death in 1352....

, a fellow nobleman of the House of Rastislalić

House of Rastislalic

Rastislalić was a Serbian noble family that held lands in the Braničevo region of Serbia in the 14th century, initially under the Serbian crown and later under the Hungarian. They held Braničevo and Kučevo.-History:...

, which held lands of northeast Serbia

Serbia

Serbia , officially the Republic of Serbia , is a landlocked country located at the crossroads of Central and Southeast Europe, covering the southern part of the Carpathian basin and the central part of the Balkans...

. Vuk, who was accountable for the death, fled to Hungary. He subsequently made peace with the Rastislalićs and returned to the Serbian court. He was however, killed in 1359, when relatives avenged the death of Branko.

He had two sons, Vlatko

Vlatko Vukovic

Vlatko Vuković Kosača was a medieval nobleman who ruled as Grand Duke of Hum.He was a son of Vuk Kosača, the founder of the medieval house of Kosača. He governed the province of Hum, which was part of the Banate of Bosnia. The Ottoman threat was building to the east, threatening neighboring...

 and Hran Vuković.