Louis, Duke of Brittany, was born in 1707 and died in 1712 at the age of 5. He was the great-grandson of Louis XIV, and the son of Louis, duke of Burgundy and of Marie-Adélaïde of Savoy. He had an older brother, also named Louis, who was born in 1704 and died in 1705. His younger brother became King Louis XV of France.
