Louis, Le Grand Dauphin was the oldest son of King Louis XIV of France, he was born in 1661 and died in April 1711. He was the father of Philip V of Spain and grandfather of Louis XV.
A question, what might have happened had he survived through whatever ailed him and killed him in otl to succeed his father as King?
Furthermore, how might things have turned out for France had his son Le Petit Dauphin not died of measles in 1712 and become the Dauphin following his father's ascesion as King