Alhaferia is a palace-fortress in Zaragoza, built by the Arabs in the 9th century; from the 15th century onwards, it has been the palace of the Catholic kings Isabella and Ferdinand. The Arab craftsmen made it with patterns and elixir, but they were unable to depict images of people and animals who were afraid of death, but managed to do so in a nondescript manner. The craftsmanship of ancient authors amazes the imagination and represents incredible examples of modern art from the distant past.