The Tsarevich of Russia (1868 - 1918, later Czar Nicholas II of Russia, left), with his cousin, Prince George, Duke of York (1865 - 1936, later King George V), UK, 1893. Nicholas is in Britain for George's wedding to Princess Mary of Teck. (Photo by Hulton Archive/Getty Images)

The Tsarevich of Russia (1868 - 1918, later Czar Nicholas II of Russia, left), with his cousin, Prince George, Duke of York (1865 - 1936, later King George V), UK, 1893. Nicholas is in Britain for George's wedding to Princess Mary of Teck. (Photo by Hulton Archive/Getty Images)