リュクサンブール宮殿
Born at the Palais d'Orléans, the present day Luxembourg Palace in Paris, he was the first and only son born to the Duke and Duchess of Orléans. His father, Gaston d'Orléans, was the youngest brother of the late Louis XIII; as such, Jean Gaston was born during the reign of his first cousin, the 11-year-old Louis XIV.