Why were serbian revolutionaries angerd by the date of francis Ferdinand's visit to sarajevo?

Serbian revolutionaries were angered by Archduke Franz Ferdinand's visit to Sarajevo on June 28, 1914, because the date coincided with the anniversary of the Battle of Kosovo, a significant event in Serbian history symbolizing national pride and struggle against foreign domination. They viewed the visit as a provocative assertion of Austro-Hungarian authority over Serbia and its people. This anger fueled nationalist sentiments and ultimately contributed to the assassination of Ferdinand, which precipitated the outbreak of World War I.