by Serbian rulers, in the villages of modern-day Kosovo area, we find Serbs living alongside Albanians and Vlachs, who are cited in the first as being between the White Drin and Lim rivers (1330). In the second Serbian golden bull (1348) a total of nine Albanian villages are cited within the vicinity of Prizren. In one of Nemanja's charters giving property to Hilandar, 170 Vlachs are mentioned, located in villages around Prizren. When Dečanski founded his monastery of Dečani in 1330, he referred to ‘villages and katuns of Vlachs and Albanians’ in the area of the white Drin. King Stefan Dečanski granted the Visoki Dečani monastery with pasture land along with Vlach and Albanian katuns around Drim and Lim rivers. Vlachs and Albanians had to carry salt and provide serf labour for the monastery. Dušan's Code included a prohibition of intermarriage between Serbs and Vlachs. The protection of Slav peasants by the Dušan's Code forced many Vlachs to migrate from Serbia. According to some scholars, during this period one can see a process of Serbianisation, including Albanians bearing Serbian names or mixed Albanian-Serbian names. Since there are many examples of both Slavic and Albanian names occurring within the same family, name evidence must be treated with caution; giving children "foreign" names can occur through inter-marriage, through imitation of a socially superior class from a different ethnic group, or simply through fashion. Ethnic identity in the Middle Ages was somewhat fluid throughout Europe, and most people at that time do not appear to have defined themselves rigidly by ethnicity. Serbian-speakers were the major linguistic group in this period. In 1355, the Serbian state fell apart on the death of Tsar Stefan Dušan and dissolved into squabbling fiefdoms. The timing fell perfectly within the Ottoman expansion. This enabled Albanian chieftains to create small principalities who had revolted several times with the aid of the Catholic Western powers. This was however short-lived as the Ottoman Empire took the opportunity of this vacuum to expand its power, just as the Nemanjićs had exploited periods of Byzantine weakness or division in their major expansions. Battle of Kosovo First Battle of Kosovo The First Battle of Kosovo occurred on the field of Kosovo Polje on June 28, 1389, when the ruling knez (prince) of Serbia, Lazar Hrebeljanović, marshalled a coalition of Christian soldiers led by Serbs that also included Bosnians, Albanians, Bulgarians, Magyars and a troop