Sébastien Pontault de Beaulieu (1612 - 1674) was a French engineer who is considered to be the first military topographer. Active during the reigns of Louis XII and Louis XIV, Pontault de Beaulieu is more accurately considered to be the creator of military topography and is best known for systematic plans of battles, sieges, military expeditions, and other affairs dealing with the army during this time period. He joined the army at fifteen during the siege of La Rochelle (1627 - 1628) and also saw combat at the siege of Arras, the siege of Perpignan, and the siege of Dunkirk, among others. His major work is entitled Les glorieuses conquêtes de Louis le Grand or Recueil de plans et sues de places assiégés, et de celles où se sont données des bataiiles, avec des discours