We all know that the suicide pact of the Austrian Crown Prince Rudolph and his mistress Mary Vetsera, who died together at Mayerling, led indirectly to the outbreak of the First World War, the resulting changes in Europe and the deaths of thousands of its sons. There have been plays, films, novels and even a ballet on the theme. What is less well known is that Prince Rudolph had a wife, the Crown Princess Stephanie, whose l