Gaston of France, (25 April 1608 – 2 February 1660), also known as Gaston d'Orléans, was the third son of the king of France Henry IV and of his wife Marie de' Medici. He was the Duke of Orléans. As a son of the king, he was a Fils de France. As the eldest surviving brother of King Louis XIII, he was known at court by the traditional honorific of Monsieur.