After their father's death, Vuk and his brothers Grgur and Nikola Radonja were forced by king Vukašin Mrnjavčević to leave their land in western Macedonia, and they retreated to the valley of Drenica. From there Vuk, who only held the humble title of gospodin, started to expand his realm and to create his own state. He took advantage of the death of king Vukašin in the Battle of Maritsa, and occupied his lands in the southern part of Kosovo and northern Macedonia with the city ofSkopje. The turning point of Vuk's ascension to power in post-Nemanjić Serbia was his marriage with Mara, daughter of the most powerful Serbian magnate prince Lazar Hrebeljanović, which brought him substantial lands in Kosovo and the city of Zvečan as dowry. This marriage sealed the alliance between two houses and secured Lazar's assistance for Vuk's future plans, although Vuk in return had to acknowledge Lazar as his feudal senior. Soon after the marriage, Lazar, Vuk and king Tvrtko I of Bosnia attacked župan Nikola Altomanović, who ruled in the western part of Serbia, and conquered and divided his lands in 1373. In the partition of Altomanović's land, Vuk got areas of Raška and lands in Polimlje. After the death of Đurađ I Balšić, Vuk captured his cities of Prizren and Peć and the area of Metohija. At its peak, the realm of Branković stretched from Sjenica in the west to Skopje in the east, with the cities of Priština and Vučitrn serving as its capitals. The most important cities in Vuk's province were Priština, Prizren, Peć, Skopje and Ras, as well as the rich mining settlements of Trepča, Janjevo, Gluhavica and others.
After the Battle of Maritza, Ottomans forced the southern Serbian feudal lords, Konstantin Dragaš, king Marko, Toma Preljubović and others, to become their vassals, and started to attack the northern Serbian lands ruled by prince Lazar and Vuk. After initial Serbian successes at the battles of Dubravnica, Pločnik and Bileća, the Ottomans launched a full-scale attack on Serbia aiming at the very heartland of Vuk's realm in central Kosovo. In the epic Battle of Kosovo Vuk participated along with his father-in-law Lazar and a contingent of King Tvrtko's army. Unlike Lazar, who died in the battle along with most of his army, Vuk managed to survive and preserve his army, which later gave material for a popular Serbian folk tradition that he betrayed Lazar in order to become supreme ruler of Serbia, a theory that is rejected by modern day Serbian historians, but not by the Serb people. Despite the consensus of modern historiography in Serbia that Vuk Branković was not a traitor in the Battle of Kosovo in 1389, Momčilo Spremić emphasized that there is a possibility that Vuk really betrayed his Serbian allies.
Last years
After the Battle of Kosovo, Vuk refused to become an Ottoman vassal, and started to plan anti-Ottoman action together with the Hungarian king Sigismund. However, Vuk was unable to resist the Ottomans for long. In 1392, they captured Skopje and forced Vuk to become their vassal and pay tribute. Even after that Vuk showed some resistance to Ottomans, refusing to participate on the Ottoman side in the battles of Rovine and Nicopolis, unlike other Serbian lords such as prince Stefan, prince Marko and Konstantin Dejanović. He also maintained contacts with Hungary. Finally the Ottomans ended this situation by attacking Vuk in 1395-96, seizing his land and giving most of it to prince Stefan Lazarević, while Vuk himself was imprisoned and died in an Ottoman prison. A small part of Vuk's land with the towns of Priština and Vučitrn were given to his sons to hold as Ottoman vassals.
Đurađ Branković, succeeded his maternal uncle Stefan Lazarević as Despot of Serbia, ruling 1427–1456
Lazar Vuković, knez
Titles
He is most often titled "Lord Vuk", while he signed himself "Lord of Serbs and Podunavlje". The Serbian Church had in the period between 1374 and 1379 accepted knez Lazar as "Lord of Serbs and Podunavlje". According to historian R. Mihaljčić, when Vuk claimed the title, Stefan Lazarević was around 15 years old. Vuk was not recognised with that title, as it was preserved for Lazar and Lazar's son Stefan.
People of his court
Braiko Pekpal
Vlatko Hranotić
Dragosav
Jakov
Nikola, kefalija
Nikolica, dijak
Pribil Kućinić
Todor Hamirović, vojvoda Prnjak and čelnik Smil
Stefan, chancellor.
Todor, son of Žegar
Legacy
portraits Vuk as a traitor: supposedly, Vuk tarnished the family name when he betrayed Prince Lazar at the Battle of Kosovo, which he survived in 1389. This tradition may be apocryphal.