The Royal Alcazar of Madrid was a palace built by Emperor Charles V, Holy Roman Emperor, (rebuilt by his son, Philip II)[4] and was the main royal residence in Madrid until the Buen Retiro Palace partly superseded it in the 17th century. It was destroyed by fire in 1734, and the present Royal Palace of Madrid was built on the site. This was called Palacio Nuevo and has never been called alcázar.