Answer
Louis Joseph, the eldest brother of Sophie of France, held the title of Dauphin of France and was known as the "Grand Dauphin." He was born on November 1, 1661, to King Louis XIV and Queen Maria Theresa of Spain. Sadly, he passed away on April 14, 1711, before ascending to the throne himself, leaving the succession to his son, Louis, who later became King Louis XV of France.