Crown Princess Beatrix of the Netherlands and Claus von Amsberg (1926-2002) with their sons, Willem-Alexander, Prince of Orange, Prince Friso and Prince Constantijn, standing on a balcony, 1980. (Photo by Keystone/Hulton Archive/Getty Images)
Crown Princess Beatrix of the Netherlands and Claus von Amsberg (1926-2002) with their sons, Willem-Alexander, Prince of Orange, Prince Friso and Prince Constantijn, standing on a balcony, 1980. (Photo by Keystone/Hulton Archive/Getty Images)