question: Where was the place of death of Grgur Golubić's father?
context: Title: Branko Mladenović
  Passage: Branko (1331–65) was a Serbian magnate who served king and emperor Stefan Dušan (r. 1331–55), and emperor Stefan Uroš V (r. 1355–71), with the titles of "sluga" and later "sevastokrator". A member of an old and respectable family, possibly descending from the Serbian dynasty itself, Branko began his royal service in the nearest circle of the ruler. After the elevation of the Serbian state to an empire (1346), Branko received the second-highest court title, "sevastokrator", usually given to relatives. He governed the Ohrid region (in Macedonia). Branko had three sons and a daughter, of whom Vuk Branković would become an important person in the period of the Fall of the Serbian Empire.
  Title: Grgur Golubić
  Passage: Grgur Golubić (1347–61) was a Serbian nobleman who served Emperors Stefan Dušan (r. 1331–55) and Stefan Uroš V as "kesar" (caesar). He was the son of "sevastokrator" Branko Mladenović, and ruled the "oblast" (province) of Polog, in what is today northwestern Republic of Macedonia. Grgur was the second son of "sevastokrator" Branko Mladenović, the governor of Ohrid under Emperor Dušan (fl. 1346). His older brother was Nikola Radonja (d. 1399) and his younger brother was Vuk Branković (1345–1397). His cousin was magnate Nikola Altomanović (fl. 1348–76), whose mother Ratoslava was Grgur's paternal aunt. His grandfather was "vojvoda" Mladen (fl. 1323–26), who served kings Stefan Milutin (r. 1282–1321) and Stefan Dečanski (r. 1321–31), and was mentioned as having governed Trebinje and Dračevica in 1323. Grgur was first mentioned in March 1347, as a "kesar", in a letter from Pope Innocentius VI to Emperor Dušan. Grgur is mentioned in charters authored by Dušan dating to 1348–54 of the Monastery of the Holy Archangels in Prizren, which point to that Grgur held a region around Prizren. Grgur and bishop Grigorije of Devol founded the Zaum monastery (Church of the Holy Virgin Zaumska, Bogorodica Zahumska) on Lake Ohrid near Zaum, to which he brought the cult of the Virgin of Zahumlje (hence its name).
answer: Serbian Empire
citations: Grgur Golubić Branko Mladenović