Épernay (Sparnacum) belonged to the archbishops of Reims from the 5th until the 10th century, when it came into the possession of the counts of Champagne. It was badly damaged during the Hundred Years' War, and was burned by Francis I in 1544. It resisted Henry of Navarre in 1592, and Marshal Biron fell in the attack which preceded its eventual capture. In 1642 it was, along with Château-Thierry, named as a duchy and assigned to the duc de Bouillon
