The first proposal for peacefully unifying Europe against a common enemy emerged after the Fall of Constantinople to the Turks in 1453. George of Podebrady, a Hussite king of Bohemia, proposed in 1464 a union of European, Christian nations against the Turks.[1] However, his proposal was based on the nations' shared religious ideology, and there is no evidence that he viewed their common geographic location as particularly significant.
