Prince Henry of Prussia (1862 - 1929) with his wife Princess Irene of Prussia (1866 - 1953), circa 1915. The prince is wearing the uniform of a Grand Admiral in the Imperial German Navy. (Photo by Estate of Emil Bieber/Klaus Niermann/Getty Images)
Prince Henry of Prussia (1862 - 1929) with his wife Princess Irene of Prussia (1866 - 1953), circa 1915. The prince is wearing the uniform of a Grand Admiral in the Imperial German Navy. (Photo by Estate of Emil Bieber/Klaus Niermann/Getty Images)