Prince Lazar Hrebeljanovic (; 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, known in historiography as Moravian Serbia, comprised the basins of the Great Morava, West Morava, and South Morava Rivers. Lazar ruled it from 1373 until his death in 1389. Lazar's political programme was the reunification of the disintegrated Serbian state under him as the direct successor of the Nemanjic dynasty, which ended in 1371 after two centuries of rule over Serbia. Lazar had a full support from the Serbian Church for this programme, but powerful Serbian nobles did not recognize him as their supreme ruler.