Undated picture of dutch dancer and spy Margaretha Geertruida Zelle, better-known as Mata Hari. Exotic dancer and courtesan in Paris, she became spy during the World War I. Mata Hari was arrested in her Paris hotel room on 13 February 1917, put on trial, accused of spying for Germany and was executed by firing squad 15 Octobre 1917 in Vincennes.