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<p>Murad I made Edirne the center and expanded Rumeli. The foundations of the Janissary were laid during this period. 1389 I. Victory was won in the Battle of Kosovo; at the end of the war, the sultan was martyred. He turned the Ottoman Empire into a Balkan power against the crusader coalitions. Timar system and kazaskerlik became institutionalized. Murad was a sultan who was on both the front and the administration. His martyrdom left a deep mark on the Ottoman tradition.It is the work of the state to come to the edge of the empire.</p>
