San Colombano Castle originates probably from the 6th century AD, but if was mentioned first time in the 10th century. The current castle was built by Frederick I, Holy Roman Emperor (Federico Barbarossa). During his second visit to Italy, he destroyed the existing castle, but decided to build a new one in 1164. The next reconstruction began in 1370. Later it has been conquered and rebuilt several times.
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.