Built between 1165 and 1167 at the time of the Norman dynasty of William I as a summer residence of the sovereign, derives its name from the Arabic al-aziz "beautiful." Located inside the park Genoardo (heaven on earth), presents in front of the great basin fed by water from the fountains of the room, it is on the ground floor and has a square base and has a vault and three niches whose domes are decorated a muqarnas (beehive-shaped) typical of Muslim architecture, and a fountain from the fact that the water runs through the groove in the ground. Many changes over the years including the battlements in the fourteenth century, and the construction of new rooms in 600. On the vault entrance are painted according to the traditions of the devils that it is impossible to count exactly, and is housed in the museum of Islamic art, with many items as parventi wood, bowls, candlesticks.