Ottoman Sultan. Sultan Murad was the Usmani Sultan who succeeded his father in 1359. He was the first of Turks to organise the formidable force with the discipline of its trained infantry, known as the 'new troop' (yeni-cheri or Janissaries). He had become the most powerful of the western Muslim rulers, and by 1372 was ready to advance into Balkans, attacking the independent kingdoms of Bulgar and Serbia, the most important powers in the Balkan Peninsula. In 1389 the Ottomans defeated the Serbian army at Kossovo Field in central Serbia. Murad was killed, but the Serbian Prince Hrelbeljanovic Lazar was captured and executed. It marked the end of Serbian independence and, to this day, Serbians revere Prince Lazar as a martyr and national hero, and have nurtured a profound hatred of Islam. Sultan Murad had conquered many parts of Europe - obtained 37 victories and had made Adrianpole his capital. Sultan Murad I was succeeded by his son Bayezied I.