Martha Fiennes, reported by Peter Stanford in The London Independent:
Her real name was Marguerite Zelle and she was born in the Netherlands in August 1876. Her father was a bankrupt hat-seller. At 18 she married a Dutch naval officer, Rudolf MacLeod, and moved with him to Java in what was then the Dutch East Indies, later Indonesia, where she had two children. The first, Norman, died as a child, possibly, it is said, as a result of poisoning. This is alleged to have been an act of revenge, carried out by a maid who poisoned the child's rice as a response to Rudolf's extreme brutality in this colonial outpost to a young Javanese soldier. ...
Marguerite emerged from the divorce "fallen" from bourgeois respectability with few options open to her. She used her natural and precocious sexual sense to reinvent herself completely – a kind of Madonna of her day. A divorcee at that time was regarded as damaged goods, so while her solution may sound extreme, it is also understandable.
She headed for Paris, where she worked initially in a circus as Lady MacLeod, but in 1905 started performing as an exotic dancer and calling herself Mata Hari, a name taken from the Indonesian and Malay words meaning literally "Dawn of the Day". She performed almost nude on some of the best stages in Europe, veiling herself and her body in elaborate layers of fantasy. She was, she would tell audiences, a princess from Java of priestly Indian birth, who had been initiated into sacred dancing as a child. Her act took on both an erotic and a quasi-religious dimension.
She had what we would today call a high skill set, both on stage and with men. She spoke seven European languages and was a courtesan with many lovers, including high-ranking military officers, who funded what became a lavish lifestyle. In the fin-de-siècle world of pre-1914 Paris, she was a celebrated figure....
She was packed off to her death because France needed someone to blame for its woes on the battlefield.