Mata Hari was the stage name of Dutch dancer Margaretha Geertruida MacLeod. Married to an army officer at 18, she spent several years living in Java, Indonesia. Her husband was an abusive alcoholic, and so in 1903, she gained a divorce, and moved to Paris.
There she became the mistress of a millionaire industrialist , and set out to make a career dancing on stage. She created an erotic act based on her time in Indonesia, claiming to be a Hindu priestess trained in the art of sacred dance.
She would slowly strip away garments until she was wearing nothing but a jeweled top, a headdress, and some bracelets. She imitated nudity by wearing a flesh-colored body stocking.
Because of her olive-tinted complexion and dark coloring, Europeans gobbled her up as an authentic bit of the east, and she became a sensation. She acted as courtesan to a number of wealthy high society men, who kept her living the high life.
However, the act's novelty slowly wore off, and she struggled to gain attention doing things other than her sexy dance.
By the start of World War I, she was getting older, her career was struggling, and her financial situation was no longer what it used to be. When theaters closed in Berlin, she was forced to go back the The Netherlands. In The Hague, she met a young wounded Russian officer by the name of Vadim de Massloff.
Nonetheless, she continued to sleep with men for money, and she eventually became entangled with rumors of espionage. What actually happened is next to impossible to ascertain, all I can really tell is that the Germans, French, AND Russians were all mad at her. She was arrested in Paris, and eventually executed for these allegations.