The Ottoman invasion that was ramping up despite heavy losses in the battle of Kosovo in 1389, was met with growing resistance. The King of Hungary Sigismund called for one of the last a crusade in history and the Crusader army consisting of forces from France, Burgundy, Hungary, Wallachia, Bulgaria, England, Aragon, Germany, Bohemia, Poland, Teutonic Order and Knights Hospitaller fought the Ottoman sultan Bayezid I (Yıldırım Bayezid) and the Prince of Serbia Stefan Lazarević at Nicopolis in Bulgaria (Никопол | Niğbolu).