Guy Tachard
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Guy Tachard, also known as Père Tachard, was a French Jesuit missionary and mathematician of the 17th century, who was sent on two occasions to the Kingdom of Siam by Louis XIV. He was born in Marthon
Chevalier de Chaumont with the Jesuits presents a letter from Louis XIV to King Narai, in 1685.
Second voyage du pere Tachard et des Jesuites envoyes par le roy (1689)
Tachard, with Siamese envoys, translating the letter of king Narai to Pope Innocent XI, December 1688
Simon de la Loubère
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Simon de la Loubère was a French diplomat to Siam, writer, mathematician and poet. He is credited with bringing back a document which introduced Europe to Indian astronomy, the "Siamese method" of mak
A page from Simon de La Loubère : Du Royaume de Siam. Illustration from the English edition (1693).
A description of the Siamese method for creating magic squares, in the English translation of Simon de la Loubère's book