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François III (February 28, 1518 – August 10, 1536) was Duke of Brittany and Dauphin of Viennois. He was the first son of King François I of France and Duchess Claude of Brittany, the eldest daughter of King Louis XII of France and Duchess Anne of Brittany.

Life

François I said of his son at birth, “a beautiful dauphin who is the most beautiful and strong child one could imagine and who will be the easiest to bring up.” His mother, Claude, Duchess of Brittany, said, “tell the King that he is even more beautiful than himself.” The Dauphin was christened at Amboise on April 25, 1519. Leonardo da Vinci, who had been brought to Amboise by François I, designed the decorations.

One of the most researched aspects of the Dauphin’s short life is the time he and his brother Henri (later King Henri II of France) spent as hostages in Spain. The king had been badly defeated and captured at the Battle of Pavia (1525) and became a prisoner of Charles V, the Holy Roman Emperor, (King Carlos I of Spain) initially in the Alcázar in Madrid. In order to ensure his release, the king signed the Treaty of Madrid (1526). However, in order to ensure that François abided by the treaty, Charles demanded that the king’s two older sons take his place as hostages. François agreed.

On March 15, 1526, the exchange took place at the border between Spain and France. François almost immediately repudiated the treaty and the eight-year-old Dauphin and his younger brother Henri spent the next three years as captives of Charles V, a period that scarred them for life.

The Dauphin’s “somber, solitary tastes” and his preference for dressing in black (like a Spaniard) were attributed to the time he spent in captivity in Madrid. He also became bookish, preferring reading to soldiering.

Marriage arrangements

As first son and heir to a king of France the Dauphin was a marriage pawn for his father. He could not be wasted in marriage, as many felt his brother Henri had been with his marriage to Catherine de’ Medici, and there were several betrothals to eligible princesses throughout the Dauphin’s life.

The first was when he was an infant, to the four-year-old Mary Tudor (later Mary I of England), daughter of Henry VIII of England and Catherine of Aragon; this arrangement was made as a surety for the Anglo-French alliance signed in October 1518, but abandoned around 1521 when Mary was instead betrothed to Charles V. Mary I of England would eventually marry Charles V’s son, King Felipe II of Spain.

Duchy of Brittany

In 1524, the Dauphin inherited the Duchy of Brittany on his mother’s death, becoming Duke François III, although the Duchy was actually ruled by officials of the French crown. The Duchy was inherited upon the death of François III by his brother, Henri; upon Henri’s succession to the French throne in 1547, the Duchy of Brittany and the Crown of France were merged, the Breton estates having already tied the succession of the Duchy to the French crown, rather than to the line of succession of the Dukes of Brittany, by vote in 1532.

Death

The Dauphin Francis died at Château Tournon-sur-Rhône on August 10, 1536, at the age of eighteen. The circumstances of his death seemed suspicious, and it is believed by many that he was poisoned. However, there is ample evidence that he died of natural causes, possibly tuberculosis. The Dauphin had never fully recovered his health from the years spent in damp, dank cells in Madrid.

After playing a round of tennis at a jeu de paume court “pré[s] d’Ainay”, the Dauphin asked for a cup of water, which was brought to him by his secretary, Count Montecuccoli. After drinking it, François collapsed and died several days later. Montecuccoli, who was brought to the court by Catherine de’ Medici, was accused of being in the pay of Charles V, and when his quarters were searched a book on different types of poison was found. Catherine de’ Medici was well known to have an interest in poisons and the occult. Under torture, Montecuccoli confessed to poisoning the Dauphin.

In an age before forensic science, poison was usually suspected whenever a young, healthy person died shortly after eating or drinking. There was no way to pinpoint and trace the substance after death; therefore, it was considered a quick, easy and untraceable form of homicide. There have been several other suspected cases of political-murder-by-poison in the French royal family through the ages.