Abel Tassin d'Alonne
Dutch courtier and diplomat (1646–1723) / From Wikipedia, the free encyclopedia
Abel Tassin d'Alonne[lower-alpha 1] (The Hague, 1646 – The Hague, 24 October 1723[2]) was a Dutch courtier and diplomat, who was private secretary[lower-alpha 2] of Mary II of England, William III of England, and Anthonie Heinsius, and played a secret role as the chief of Heinsius' Cabinet noir and as a cryptographer of note.