File:To my people, Franz Joseph, 1914, Czech translation.jpg

Summary
Photo of manifest "To my people" (An meine Völker, here in Czech translation) signed by Emperor Franz Joseph on July 28, 1914, announcing declaration of war on Serbia. This had started World War I.

Copied from http://www.vcm.cz/modules.php?name=News&file=article&sid=86. I guess it is public domain by all possible interpretations.