Jurij Slatkonja was a choirmaster for which State of the Holy Roman Empire?
Duchy of Carniola The Duchy of Carniola (Slovene: "Vojvodina Kranjska" , German: "Herzogtum Krain" ) was a State of the Holy Roman Empire, established under Habsburg rule on the territory of the former East Frankish March of Carniola in 1364. A hereditary land of the Habsburg Monarchy, it became a constituent land of the Austrian Empire in 1804 and part of the Kingdom of Illyria until 1849. A separate crown land from 1849, it was incorporated into the Cisleithanian territories of Austria-Hungary from 1867 until the state's dissolution in 1918. Its capital was Ljubljana.
Lazar of Serbia Prince Lazar Hrebeljanović (; ca. 1329 – 15 June 1389) was a medieval Serbian ruler who created the largest and most powerful state on the territory of the disintegrated Serbian Empire. Lazar's state, referred to by historians as Moravian Serbia, comprised the basins of the Great Morava, West Morava, and South Morava rivers. Lazar ruled Moravian Serbia from 1373 until his death in 1389. He sought to resurrect the Serbian Empire and place himself at its helm, claiming to be the direct successor of the Nemanjić dynasty, which went extinct in 1371 after ruling over Serbia for two centuries. Lazar's programme had the full support of the Serbian Orthodox Church, but the Serbian nobility did not recognize him as their supreme ruler.