Tårnborg Castle was a royal medieval castle. It consisted of a central tower of 8m x 8m, surrounded by a square outer wall. An excavation in the castle courtyard in 1894 also revealed the remains of three small houses. The castle stood from about 1231 up to the last part of the 14th century when a new castle in Korsør took over Tårnborg's role. From written sources we know that the castle was captured several times, once in 1326 when King Christopher II’s son was forced to submit to the rebellious troops after a two-week siege.
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.