Sobowidz Castle was built in the second half of 14th century by the Teutonic Order. During the Polish–Lithuanian–Teutonic War it was conquered by Polish, but later returned to Teutonic Order. The castle was mainly destroyed in 1454 when Teutonic Knights surrended. In the 16th century the castle was rebuilt to Governor palace, but it was again destroyed by Swedish army in the 17th century and demolished in 19th century. The current red-brick building was built after that. Today Gothic basement, moat and parts of the wall remain of medieval castle.
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.