Jean Errard or Errard de Bar-le-Duc was a mathematician and military engineer, initially in the service of the ducal court of Lorraine and then of Henry IV of France. He introduced Italian bastions to France and was a forerunner of Vauban as well as uncle to the painter Charles Errard the Elder.
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Jean Errard or Errard de Bar-le-Duc was a mathematician and military engineer, initially in the service of the ducal court of Lorraine and then of Henry IV of France. He introduced Italian bastions to France and was a forerunner of Vauban as well as uncle to the painter Charles Errard the Elder. He has been called the "father of French fortification".
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