Crusade of St. John of Capistrano. The Crusade of St. John of Capistrano (1456), also known as the Siege of Belgrade of 1456, began after the fall of Constantinople in 1453 when Mehmet II set his sights on the Kingdom of Hungary. The Ottoman forces were defeated by an army led by Catholic priest John of Capistrano and John Hunyadi. Crusade of Nicholas V (1455–1456).Bain, R. Nisbet. The Siege of Belgrade by Muhammad II, 1456. In The English Historical Review, VII (1892). pp. 235-258Father Cuthbert (1910). "St. John Capistran". In Herbermann, Charles (ed.). Catholic Encyclopedia. 8. New York: Robert Appleton Company.
