Csesznek castle was built around 1263 by the Jakab Cseszneky who was the swordbearer of the King Béla IV. He and his descendants have been named after the castle Cseszneky. Between 1326 and 1392 it was a royal castle, when King Sigismund offered it to the House of Garai in lieu of the Macsó Banate. In 1482 the male line of the Garai family died out, and King Matthias Corvinus donated the castle to the Szapolyai family. In 1527, Baron Bálint Török became its owner.
During the 16th century the Csábi, Szelestey and Wathay families were in possession of Csesznek. In 1561, Lőrinc Wathay repulsed successfully the siege of the Ottomans. However, in 1594 the castle was occupied by Turkish troops, but in 1598 the Hungarians recaptured it.
In 1635, Dániel Esterházy bought the castle and village and from that time on Csesznek was the property of the Esterházy family until 1945.
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.