Claude II de Lorraine, duc d'Aumale was a Prince étranger, military commander and French governor, during the latter Italian Wars and the early French Wars of Religion. The son of the first Duke of Guise he started his career in a pre-eminent position in French politics as a son of one of the leading families in the court of Henri II of France. Upon the death of his father in 1550, Aumale inherited the governorship of Burgundy from his father, and the duchy of Aumale from his brother who assumed the titles of Guise. Aumale was made colonel-general of the light horse by the new king and fought in Italy, Alsace and Picardie between 1551 and 1559. While leading the light cavalry during the defence of Metz he was captured, and held for the next two years, until his mother in law Diane de Poitiers paid his ransom. He achieved success at the siege of Volpiano and played an important role in the capture of Calais for which he was rewarded with the governorship of French Piedmont.

The County of Aumale, later elevated to a duchy, was a medieval fief in Normandy, disputed between France and England during parts of the Hundred Years' War.