The construction of the Przezmark castle started at the beginning of the 1300s continued until c. 1350. In the next centuries the stronghold was repeatedly converted because it was adjusted to new functions: the seat of a commune head, a prosecuting attorney and a convent. Since the beginning of the 16th century the castle belonged to the bishops of Pomesania as to later come into hands of the families of von Egmon and von Verdte. After the period of the private owners, came the period, in which the stronghold performed the function of the seat of the offices to finally decline and to be disassembled in the 18th century The first of the old names of the castle suggests that before the Teutonic times there existed the Prussian merchant settlement. The tower that has survived till our time emerged around 1329 and is called the Prisoner-Of-War Tower.
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.