Alange Castle was built by the Arabs in the 9th century on a rocky hill, over the Matachel River, on the banks of the Alange reservoir. This defence fortress is at a strategic point from which access to the Silver Way was controlled. Its inaccessibility makes it a privileged place. It was witness to numerous battles and sieges between Moors and Christians.
The castle was conquered by Christians during Reconquista in the mid-13th century. It was abandoned in 1550. Although the castle was a great fortress, nowadays only three towers and the keep, made of strong brick walls and with numerous windows with horseshoe-shaped arches, remain. Some wells from the Islamic period are also preserved.
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.