 Initially called the Château de Boulogne, the new building quickly became known as the Château de Madrid, taking its name from the Royal Alcázar of Madrid, the royal castle in Madrid.Both buildings were constructed on the edge of a forest near a large city, and both were made up of a long central "corps de logis" with loggias on two storeys and a cubical pavilion at each end.The construction work was at first directed by Florentine Girolamo della Robbia and later by French architects.