Battle of the Field of Blackbirds in Kosovo (Kosovo Polje) in which the Christian Serbs of the Prince of Serbia are defeated by the Ottoman Osmalis of Murad and his Christian vassals, as part of the Ottoman advance that will result in the siege of Vienna and which will end with the fall of Constantinople. Prince Lazar is captured and executed while Murad dies in mysterious circumstances and his son Bayazid I ascends the throne.
