Françoise de Lorraine (1592–1669)

Françoise de Lorraine, Duchess of Vendôme
Duchess of Vendôme
Engraving of Françoise while a widow
Born	1592 France
Died	8 September 1669 Paris, France
Burial	Capucins, Paris, France
Spouse	César, Duke of Vendôme
Issue Detail	Louis, Duke of Vendôme François, Duke of Beaufort Élisabeth, Duchess of Nemours
Full name Françoise de Lorraine-Mercœur
Father	Philippe Emmanuel, Duke of Mercœur
Mother	Marie de Luxembourg

Françoise de Lorraine-Mercœur (November 1592 – 8 September 1669) was a princess of Lorraine and daughter-in-law of Henry IV of France. Sometimes known as Françoise de Mercœur, she belonged to the Mercœur cadet branch of the sovereign Dukes of Lorraine and was a niece of Louise of Lorraine, wife of the previous King Henry III. Françoise was the heiress of her father and, as such, was the Duchess of Mercœur and Penthièvre suo jure.

Françoise was the younger of two children. She was born in November 1592 with the exact date unknown; her only sibling, Philippe Louis, died in 1590 aged one making her the heiress to a large private fortune. During the reign of Henry III, her father had put himself at the head of the Catholic League in Brittany, and had himself proclaimed protector of the Roman Catholic Church in the province in 1588. Invoking the hereditary rights of his wife, who was a descendant of the Dukes of Brittany, he endeavoured to make himself independent in that province, and organised a government at Nantes, calling his son "prince and duke of Brittany".

With the aid of the Spaniards he defeated Henri de Bourbon, Duke of Montpensier, whom Henry IV of France had sent against him, at Craon in 1592. The king marched against Meroeur in person. As part of their peace they drew up a marriage contract in 1596 whereby his daughter, would marry Henry's legitimised son.

The French and Spanish then signed the Peace of Vervins on 2 May 1598 when Françoise was 6; part of the treaty again stipulated that the young Françoise would be engaged to the illegitimate child of Henry IV, César de Bourbon, Duke of Vendôme. Vendôme was the eldest child of the King and his mistress Gabrielle d'Estrées.