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Charles IV (5 April 1604, Nancy – 18 September 1675, Allenbach) was Duke of Lorraine from 1624 to 1634, when he abdicated under French pressure in favor of his younger brother, Nicholas Francis, and again from 1661 until 1675 (his death).
Balfour notably served as Scottish Ambassador to the Grand Duke of Tuscany and the Duke of Lorraine in 1606 and was a member of the Scottish Privy Council.
The Dukes of Lorraine controlled the transit of salt and wheat towards the mountains, and imposed a 'protection levy' on the 'Saulniers Way', a well frequented trade route across the mountains towards Sélestat and Saales.
His eldest daughter Agnes, from his first marriage, married Frederick II, Duke of Lorraine.
His successor was Matthias his brother; his widow remarried his old rival, Theobald of Champagne.
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In 1216, in the Champagne War of Succession, he supported Erard I, Count of Brienne, in his quarrel with Theobald IV, Count of Champagne, who was supported by Philip II of France, Frederick II, Holy Roman Emperor, and Henry II of Bar.
Theobald I, Duke of Lorraine took on Erard's cause, as did his brother-in-law Miles, Seigneur de Noyers, and his nephew André de Pougy, Seigneur de Marolles-sur-Seine and de Saint Valérien.