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Marko Mrnjavevi was the Serbian king from 1371 to 1395, while de facto he ruled only over a territory in western Macedonia centered on the town of Prilep. He is known as Prince Marko, and King Marko.
in South Slavic oral tradition, in which he has become a major character during the Ottoman occupation of the Balkans. Marko`s father, King Vukain, was the co-ruler of Serbian Tsar Stefan Uro V, whose reign was marked by the weakening of the central authority and the gradual disintegration of the Serbian Empire. Vukain`s personal holdings included lands in western Macedonia, Kosovo and Metohija. In 1370 or 1371, he crowned Marko "young king"; this title included the possibility that Marko succeed the childless Uro on the Serbian throne.
Source link: http://www.tabanovic.com/marko%20kraljevic.htm