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Jean, comte de Gassion (1609 Pau – 1647 Lens) was a Gascon military commander for France, prominent at the battle of Rocroi (1643) who reached the rank of Marshal of France at the age of thirty-four. He served Louis XIII and Louis XIV and died of wounds sustained during the 1647 siege of Lens (not to be confused with the Battle of Lens the following year).