Jean Errard, also called Errard de Bar-le-Duc, was a mathematician and military engineer born at Bar-le-Duc around 1554, who died on 20 July 1610. He served the ducal court of Lorraine and, after converting from Protestantism to Catholicism, Henry IV of France, and he introduced Italian bastions to France, which has earned him the title father of French fortification and made him a forerunner of Vauban. A Protestant by 1572, he joined the University of Heidelberg in 1573 and was a good student of mathematics and geometry. He entered the service of Charles III of Lorraine in 1580 and dedicated to him his Premier livre des instruments mathématiques, printed at Nancy in 1584. His fortification designs include the citadels of Amiens and Doullens and works at Calais, Laon and Bayonne.
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Jean Errard or Errard de Bar-le-Duc (c. 1554 - 20 July 1610) was a mathematician and military engineer, initially in the service of the ducal court of Lorraine and then (after converting from Protestantism to Catholicism) of Henry IV of France.
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Jean Errard or Errard de Bar-le-Duc (c. 1554 - 20 July 1610) was a mathematician and military engineer, initially in the service of the ducal court of Lorraine and then (after converting from Protestantism to Catholicism) of Henry IV of France.
Biography, birth
Jean Errard or Errard de Bar-le-Duc (c. 1554 - 20 July 1610) was a mathematician and military engineer, initially in the service of the ducal court of Lorraine and then (after converting from Protestantism to Catholicism) of Henry IV of France.
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He introduced Italian bastions to France and was a forerunner of Vauban as well as uncle to the painter Charles Errard the Elder.
In Branch: Applied and Computational Mathematics, Lead, field of work
Jean Errard or Errard de Bar-le-Duc (c. 1554 - 20 July 1610) was a mathematician and military engineer, initially in the service of the ducal court of Lorraine and then (after converting from Protestantism to Catholicism) of Henry IV of France.
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