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Johann Theodor Jablonski (15 December 1654, in Danzig – 28 April 1731, in Berlin) was a German educator and lexicographer who also wrote under the name Pierre Rondeau.



Johann Theodor Jablonski was the son of Peter Figulus from Jablunka in Moravian Wallachia, and the older brother of reformer Daniel Ernst Jablonski. He soon traveled to Amsterdam where he was educated by his grandfather John Amos Comenius. After the death of Comenius, he went back to Germany and became a student in the Joachimsthal Gymnasium [de] in Berlin. From 1672 he studied at the Albertina in Königsberg, then in 1674 continued his education at the university in Frankfurt an der Oder.[1]

In 1680, he undertook a trip to the Netherlands and to England. In 1687, he became the secretary of Princess Marie Eleonore of Anhalt-Dessau, and in 1689 the secretary of Heinrich of Saxe-Weissenfels, Count of Barby. In 1700 he returned to Berlin as a tutor to Friedrich Wilhelm of Prussia.[1]

Title page of Allgemeines Lexicon der Künste und Wissenschaften (1721)


His masterpiece is the Allgemeines Lexicon der Künste und Wissenschaften ("General Dictionary of Arts and Sciences"), which appeared in 1721.

In the years 1711–12 he published, under the pseudonym of Pierre Rondeau, a Franco-German and German-French dictionary and a grammar of the French language. He also translated De moribus Germanorum of Tacitus (1724).[2]


He was named secretary of the newly-founded Prussian Academy of Sciences in 1700.[3]


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