The Battle of Kosovo, also known as the Battle of Kosovo Field or the Battle of Blackbird's Field, takes place on St. Vitus' Day, June 15, 1389, between the army led by Serbian Prince Lazar Hrebeljanović, and the invading army of the Ottoman Empire under the leadership of Sultan Murad I.

The army under Prince Lazar consists of his own troops, a contingent led by Serbian nobleman Vuk Branković, and a contingent sent from Bosnia by King Tvrtko I, commanded by Vlatko Vuković.

Prince Lazar is the ruler of Moravian Serbia, and the most powerful among the Serbian regional lords of the time, while Vuk Branković rules a part of Kosovo and other areas, recognizing Lazar as his overlord.

The Battle of Kosovo takes place in the Kosovo Polje, about five kilometers northwest of modern-day Pristina.Reliable historical accounts of the battle are scarce; however, a critical comparison with historically contemporaneous battles (such as Angora or Nikopolis) enables reliable reconstruction.

The bulk of both armies is wiped out in the battle; both Lazar and Murad lose their lives in it.

Although Ottomans manage to annihilate the Serbian army, they also suffer high casualties that delay their progress.

Serbs are left with too few men to effectively defend their lands, while the Turks have many more troops in the east.

Consequently, one after the other, the Serbian principalities that ae not already Ottoman vassals become so in the following years.

The Battle of Kosovo is particularly important to Serbian history, tradition, and national identity.