Abstract:. This article reveals the existence of a hitherto unknown Black Chamber in the Dutch Republic and the identity of its principal codebreaker, Abel Tasien d 'Alonne ( -), acting also as private secretary to Grand Pensionary Heinsius. On the basis of an analysis of a number of previously unidentified worksheets, three cases are put together that merited d 'Alonne's attention, one related to a French diplomat at the court of the Bavarian Elector during the years -, one related to an undercover agent of th… Show more
The Dutch Royal Archives (Koninklijk Huisarchief -KHA) at The Hague holds a number of enciphered letters written by French diplomats in Holland in the 17th and 18th centuries, including a letter, from
The Dutch Royal Archives (Koninklijk Huisarchief -KHA) at The Hague holds a number of enciphered letters written by French diplomats in Holland in the 17th and 18th centuries, including a letter, from
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