On August 7, 1876, Margaretha Geertruida Zelle was born in Leeuwarden, in the Netherlands. Exactly 150 years later, the date offers an unusual opportunity: looking at Mata Hari without starting with the legend of the seductress capable of extracting secrets from generals and deciding battles.
The birth certificate itself helps to establish the first fact. The civil registry states that Margaretha was born on August 7th and that her birth was registered on the 8th. The distinction is relevant because even older institutional sources published August 8th as her date of birth. The civil document and the current Fries Museum biography, however, converge on August 7, 1876.
The anniversary is not going unnoticed in his hometown. Leeuwarden organized an anniversary program in 2026 between May 23 and August 7, with exhibitions, tours, cinema and other activities dedicated to Mata Hari's 150th birthday.
The interest remains because her story admits a more complex answer than “spy” or “innocent”. There are documented facts about her contacts with intelligence services, a judicial conviction that actually occurred and, at the same time, a considerable distance between what the archives allow to demonstrate and the image of the “super spy” immortalized in the 20th century.
What is fact, what requires caveats and what belongs to myth
| Affidavit | Historical situation | What the sources support |
|---|---|---|
| Margaretha Zelle was born on August 7, 1876 | Documented | Leeuwarden's civil registry reports birth on the 7th and registration of the occurrence on the 8th. |
| Mata Hari was an Asian-born princess or temple dancer | Character created by her | Identity documents confirm your Dutch birth; different “exotic” origins were part of the stories he presented to the public and the press. |
| She had relations with German and French intelligence services | Heavily documented | Archives and institutional reconstructions show recruitment and contacts with both sides during the war. |
| The H21 code was linked to Mata Hari | Central part of the case | German messages referring to agent H21 were part of the investigation; the Fries Museum collection reports that she admitted to receiving German money and recognized the code, although she denied having spied on France for Germany. |
| She gave away decisive secrets and caused the deaths of tens of thousands of soldiers | Not demonstrated by available files | The Service historique de la Défense itself states that, after the war, the French and Germans were unable to demonstrate that it had provided information of capital importance. |
| History has already proven that Mata Hari was completely innocent | Also a simplification | The fragility of the most spectacular accusations does not erase his contacts, the money he received or his involvement with secret services. The extent and effectiveness of this involvement remains a subject of historical interpretation. |
Margaretha Zelle existed before Mata Hari
The public figure was not born during the First World War. It had been under construction for years.
Margaretha was the daughter of Adam Zelle, a hat merchant, and spent part of her childhood in comfortable conditions before the family's financial ruin. At the age of 18, he met Rudolph MacLeod, an officer in the Royal Netherlands East Indies Army. They married in 1895 and left for the Dutch East Indies in 1897. They had two children. The marriage deteriorated, the family suffered the death of the boy Norman and the couple ended up separating after returning to Europe.
Margaretha tried life in Paris in 1903 and returned definitively to the city in 1904. It was there that she transformed her own biography into a spectacle. On March 13, 1905, he performed at the Musée Guimet under the name Mata Hari, an expression usually translated as “eye of the day” in Malay. He created numbers inspired by European imagery about Asia and told different versions of its supposed origins: in some, it was a princess from Java; in others, he would have been born into a religious environment in India.
These stories were false as biography, but they functioned as an artistic and advertising construction. The success was real. Mata Hari toured major European stages, frequented elite environments and became a celebrity before any accusations of espionage entered her life.
This distinction is important. The fact that Margaretha invented an origin for her stage persona does not prove that she lied about all subsequent accusations. It shows, however, how from an early age Mata Hari's story was composed of a mixture of real person, self-promotion and public imagination.
The war turned mobility into suspicion
When the First World War began in 1914, Mata Hari's career lost ground. As a citizen of the Netherlands, a country that remained neutral, she still had international mobility that was unusual in a Europe at war. At the same time, his travels and his relationships with officers of different nationalities began to attract the attention of the secret services.
According to the reconstruction of the Fries Museum based on documentation from the period, in 1916 she received a proposal from a German representative in The Hague to act as an agent, with the code H21, and received 20 thousand francs. Later, during French interrogations, he admitted to having accepted the money, but maintained that he did not intend to actually work for Germany and that he considered the amount compensation for goods that the Germans had confiscated.
At the same time, Mata Hari entered the orbit of French counterintelligence. Georges Ladoux, who was already observing her, discussed a mission to France with her. She subsequently traveled through Spain and maintained contact in Madrid with both German and French representatives. Correspondence and other preserved documents show that it is not correct to reduce all this activity to a later invention: she actually got involved in the intelligence game.
The problem is taking the next step and transforming this involvement into the career of an extremely efficient agent.
German messages referring to agent H21 were intercepted and deciphered and ended up integrated into the case material. The Service historique de la Défense even keeps records of deciphering correspondence and telegrams linked to the Mata Hari trial.
But an identification in intelligence communications, the receipt of money and the making of contacts do not in themselves demonstrate that she obtained decisive secrets or caused major military losses.
The conviction is a fact; the “greatest spy” narrative is another matter
Mata Hari was arrested in Paris on February 13, 1917. The process was conducted by the French military justice system. After interrogations and testimony gathering, his trial began on July 24, behind closed doors, and lasted two days. On July 25, the 3rd War Council declared her guilty of espionage and maintaining relations with the enemy with the aim of promoting their operations.
She requested a review of the sentence on the same day. The appeal was rejected on August 17. His request for grace also did not succeed. On 15 October 1917, aged 41, Margaretha Geertruida Zelle was executed by firing squad in Vincennes.
None of this is a myth: there was an investigation, trial, conviction and execution.
The historical question is different: did the material gathered justify the image of an exceptionally dangerous agent?
The current presentation of the Service historique de la Défense itself offers a cautious response. The institution states that, after the war, neither the Germans nor the French were able to demonstrate that Mata Hari had handed over information of capital importance to either side. The page refers to the military historian Frédéric Guelton, whose interpretation is that of a woman linked to both services, but who probably never carried out very effective espionage.
This does not automatically produce a historic verdict of “innocence.” It produces something more precise: the 1917 judicial conviction is documented, while the extraordinary dimension attributed to the supposed damage caused by it does not find equivalent support in the archives.
The context of 1917 also matters
Mata Hari was not tried at a politically neutral time. A few months earlier, the French Chemin des Dames offensive had failed with enormous losses. Discontent spread among the troops and there were collective refusals of obedience and mutinies in French Army units.
This context feeds one of the most important interpretations of the case: that Mata Hari also served as a scapegoat in a period of military crisis and the search for internal perpetrators.
Historian Julie Wheelwright, who has researched French military archives, argues that the accusation helped construct Mata Hari as a foreign and dangerous “femme fatale.” In her analysis, the documents offer no evidence that she used sexual relations to extract military secrets from Allied officers, although this image became one of the pillars of her later fame.
It is a historiographical interpretation, and must be presented as such. French failure on the battlefield does not prove that the process was invented. But it helps to understand why a woman already known for her public sexuality, international relationships and “exotic” scenic identity could be converted into a symbol of a threat much greater than the operational effectiveness that the documents allow to prove.
The “super spy” grew up after her death
The transformation did not end before the firing squad. According to the French military archive, the legend began practically immediately. Books about Mata Hari proliferated in the interwar period, and cinema helped to consolidate the figure of the irresistible woman who seduced powerful men to steal secrets. Greta Garbo played her in 1931; many other versions came later.
Wheelwright shows how some of the first narratives presented as fact episodes unsupported by military archives. Stories of Mata Hari seducing Allied soldiers for information, for example, circulated from one biography to another and came to seem like documentation simply because they had been repeated.
There is an irony in this: Margaretha Zelle was one of the first people responsible for transforming her own life into a narrative. He invented origins, composed a character and learned how to feed the interest of the press. After 1917, he lost control of history. State, journalists, memoirists, biographers, novelists and filmmakers continued writing “Mata Hari” about a woman who could no longer respond.
At 150 years old, which Mata Hari remains?
The most document-friendly reading avoids both extremes.
Mata Hari does not need to be transformed into a martyr completely unrelated to espionage: there is evidence of money received, contacts with German agents, involvement with French intelligence and the H21 code associated with the case. There is also no good basis for continuing to describe her as a masterful spy whose seduction would have cost tens of thousands of lives.
She entered the world of intelligence, apparently without the professionalism that her later legend attributed to her. She was tried and executed as a spy. The real importance of the information he transmitted, however, seems much smaller than the reputation created around his name.
On the sesquicentenary of his birth, this is perhaps precisely the most interesting part of the story. Margaretha Zelle created Mata Hari to conquer the stage. War and popular culture transformed this character into something else: an archetypal female spy who survived for more than a century by dint of repetition.
To get to know the woman behind him, the safest way remains to go back to civil records, letters, military documents and preserved objects — and ask, in each episode, whether we are facing a fact, an accusation or a story that became too good to disappear.
