Plavecký Castlee was built as a royal frontier castle between 1256 and 1273. Until the 16th century it was owned by Counts of Jur and Pezinok. In the second half of the 16th century the castle was rebuilt into a Renaissance style with the lower court. Gradually it was again fortified and maintained during the 17th century (new cannon towers were added then). In 1706 the castle was damaged the imperial army that conquered it from the rebels.
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.