Eufemio Castle is mentioned in several historical sources, the oldest dating back to the first decades of the 12th century. It was described as an important place for the old town, thanks to its strategic position. In the 13th century, the importance of the Eufemio Castle grew considerably, as it was one of the main ones imperial castles of the reign of Frederick II of Swabia, whose guards guarded him during the battle against Muslims, who resided near the historic Segesta.
In the following centuries, the Eufemio Castle was inhabited by the various feudal lords who took turns at the command of Calatafimi Segesta, up to the 19th century, where it was used as prigione. Eufemio Castle remained in operation until 1868, only to be totally abandoned to itself, causing its state of degradation which, over time, saw the collapse of many of its parts. Today it is partially restored.
The Eufemio Castle would have been equipped with three towers, two still visible today in its remains, while there is no trace of the third, a fate shared also with the walls who would have wrapped it up to improve its defense system. Once you entered the Eufemio Castle, on the left there would have been the prisons, some walls of which have still been left engravings made, in all probability, by the prisoners themselves while serving their penalties. The Eufemio Castle would also have had a upper floor, which would have been used as a residence for the reigning feudal family.
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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.