Lazar of Serbia
"Vidovdan" is actually anniversary of the religious holiday of the same name, the date of special importance to ethnic Serbs: on June 28, 1389, according to the Serbian Orthodox religious tradition, and according to the Serbian romantic (19th century) national identity founding tradition, the Ottoman Empire fought against Serbia in the Battle of Kosovo, and duke Lazar of Serbia was slain in battle. Ottoman Sultan Murad I was killed by the Serbian knight Miloš Obilić.