Battle of Kosovo
After Prince Lazar Hrebeljanović was killed in the Battle of Kosovo on June 28, 1389, his son Stefan Lazarević succeeded him. Being a minor, his mother Princess Milica ruled as his regent. A wise and diplomatic woman, she managed to balance the Ottoman threat as the Ottoman Empire was in a turmoil after the Battle of Kosovo and the killing of Sultan Murad I. She married her daughter, Olivera, to his successor, Sultan Bayezid I.