Battle of Varna (1444)
The Battle of Varna was fought between the Ottoman forces and a Crusader army under the command of Wladyslaw III, King of Poland and Hungary, and Janos Hunyadi near Varna in Bulgaria on November 10, 1444. Wladyslaw III and Hunyadi seem to be close to victory but the Crusader army was severely defeated. Wladyslaw was killed in the battle and Poland was left without a king. The Ottomans unchallenged by Central European powers had a open way to conquest of Constantinople and the remainder of the Balkan Peninsula.