Louis XVI was the grandson of Louis XV. He became Dauphin in 1765 and inherited the throne in 1774 at the age of 20. In 1770 the Dauphin Louis, future Louis XVI, married Marie-Antoinette de Lorraine, Archduchess of Austria. Together they had four children. Only the eldest, Madame Royale, born in 1778, and the Second Dauphin, born in 1785, survived to see the outbreak of the French Revolution.