The Castello Normanno ('Norman Castle') in Paternò was built in 1072 by Count Roger I of Sicily to protect the Simeto valley from Islamic raids. The first nucleus of the fortress was soon enlarged, and it subsequently lost its original military functions. Under Henry VI it was made the seat of the Count of Paternò, assigned to his fellow Swabian Bartholomew of Luci. Later the castle housed kings and queens, such as Henry's son Emperor Frederick II, Eleanor of Anjou and Blanche I of Navarre, as the castle had been included in the so-called Camera Reginale estates ('Queen's Chamber') by King Frederick III of Sicily.
The Chamber was abolished in the 15th century, and in 1431 the castle was acquired by the Special family; until 1456 it was owned by the Moncada family. Used as a jail, in the following centuries it became increasingly decayed, until restoration work begun in the 19th century brought it back to its ancient prominence.
The castle has a rectangular plan, on three floors, with a height of 34 m. Originally, it had Ghibelline-style merlons, of which today only remains can be seen. Notable is the colour effect created by the dark shade of the stones and the frames of the Gothic-style mullioned windows, in white limestone.
The first-storey houses several service chambers and the Chapel of St. John, decorated with precious 13th-century frescoes. The piano nobile houses a large Weapons Hall. The king's residence was located in the upper floor.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.