Louis was the third son of the dauphin Louis and his consort Maria Josepha of Saxony. At first known as the duc de Berry, he became the heir to the throne on his father's death in 1765. His education was entrusted to the duc de La Vauguyon (Antoine de Quélen de Caussade). He was taught to avoid letting others know his thoughts, which has led to sharp disagreement about his intelligence. Louis nevertheless possessed an excellent memory, acquired a sound knowledge of Latin and English, and took an interest in history and geography. In 1770 he married the Austrian archduchess Marie-Antoinette, daughter of Maria Theresa and the Holy Roman emperor Francis I.