Principality of Catalonia
The Ancien Régime province of Roussillon, which had formerly been integrated with the Catalan counties, the Kingdom of Majorca, and the Principality of Catalonia within the Crown of Aragon, was attached to the Crown of France under the Treaty of the Pyrenees, signed on 7 November 1659. Prior to this treaty, the border between the kingdom of France and the Principality of Catalonia lay further north, along a line of citadels (Treaty of Corbeil).