Niska Banja, Serbia...Niška Banja (The Spa of Niš) is located 10 km away from Niš on the road to Sofia, 248 meters above sea level. The study of the density of sinter deposits, which originally created the terraces in the spa, reveals that the wellspring of Niška Banja has been active for 26,000 years. The spa is
Princess Olivera Lazarević, Despina Hâtûn (Serbian Cyrillic: Деспина Оливера Лазаревић,(ca. 1373. - died after 1444.)) the youngest daughter of Lazar of Serbia and Milica and wife of Ottoman Sultan Bayezid I, whom she married just after the Battle of Kosovo in 1389, as a pledge of peace between the Lazarević family and the Ottoman Empire.