Robert Elsie: According to tradition, Sultan Murad I (r. 1359-1389), who had been occupied pacifying Asia Minor, returned to the Balkans and brought together a huge coalition of forces from among his southern Serbian and Bulgarian vassals, many of whom were Christians, such as Constantine Dejanovich and the famed Serb leader Marko Kraljevich, enemy of Lazar. The opposing forces under Prince Lazar of Serbia und King Tvrtko of Bosnia were a coalition including Bosnian troops under Vlatko Vukovich, the Vlach contingents of Voyvode Mircea, the troops of Lazar’s son-in-law Vuk Brankovich and Albanian forces under George Balsha, Paul Kastrioti and Demeter Jonima.