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Vukašin Mrnjavčević was a skilful politician, and gradually assumed the main role in the empire.[14] In August or September 1365 Uroš crowned him king, making him his co-ruler.

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Marko is portrayed as a protector of the weak and helpless, a fighter against Turkish bullies and injustice in general. He was an idealised keeper of patriarchal and natural norms: in a Turkish military camp, he beheaded the Turk who dishonourably killed his father. He abolished the marriage tax by killing the tyrant who imposed it on the people of Kosovo. He saved the sultan's daughter from an unwanted marriage after she entreated him, as her blood brother, to help her. He rescued three Serbian voivodes (his blood brothers) from a dungeon and helped animals in distress. Marko was a rescuer and benefactor of people, and a promoter of life; "Prince Marko is remembered like a fair day in the year".[44]

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Marko Mrnjavčević (Serbian Cyrillic: Марко Мрњавчевић, pronounced [mâːrko mr̩̂ɲaːʋt͡ʃeʋit͡ɕ]  c. 1335 – 17 May 1395) was the de jure Serbian king from 1371 to 1395, while he was the de facto ruler of territory in western Macedonia centered on the town of Prilep. He is known as Prince Marko (Serbo-Croatian: Краљевић Марко, Kraljević Marko, IPA: [krǎːʎeʋit͡ɕ mâːrko]) and King Marko (Bulgarian: Крали Марко; Macedonian: Kрaле Марко) in South Slavic oral tradition, in which he has become a major character during the period of Ottoman rule over the Balkans. Marko's father, King Vukašin, was co-ruler with Serbian Tsar Stefan Uroš V, whose reign was characterised by weakening central authority and the gradual disintegration of the Serbian Empire. Vukašin's holdings included lands in western Macedonia and Kosovo. In 1370 or 1371, he crowned Marko "young king"; this title included the possibility that Marko would succeed the childless Uroš on the Serbian throne.

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Marko Mrnjavčević (Serbian Cyrillic: Марко Мрњавчевић, pronounced [mâːrko mr̩̂ɲaːʋt͡ʃeʋit͡ɕ]  c. 1335 – 17 May 1395) was the de jure Serbian king from 1371 to 1395, while he was the de facto ruler of territory in western Macedonia centered on the town of Prilep. He is known as Prince Marko (Serbo-Croatian: Краљевић Марко, Kraljević Marko, IPA: [krǎːʎeʋit͡ɕ mâːrko]) and King Marko (Bulgarian: Крали Марко; Macedonian: Kрaле Марко) in South Slavic oral tradition, in which he has become a major character during the period of Ottoman rule over the Balkans. Marko's father, King Vukašin, was co-ruler with Serbian Tsar Stefan Uroš V, whose reign was characterised by weakening central authority and the gradual disintegration of the Serbian Empire. Vukašin's holdings included lands in western Macedonia and Kosovo. In 1370 or 1371, he crowned Marko "young king"; this title included the possibility that Marko would succeed the childless Uroš on the Serbian throne.