Francis III was Dauphin of France and, after 1524, Duke of Brittany. Francis and his brother, Henry, were exchanged as hostages for their father, Francis I, who had been captured at the Battle of Pavia. They would be hostages for three years. Wikipedia
Born: February 28, 1518, Château Royal d'Amboise, Amboise, France
Died: August 10, 1536 (age 18 years), Tournon-sur-Rhône, France
Siblings: Henry II of France
Parents: Francis I of France and Claude of France
Reign: 20 July 1524 – 10 August 1536