Sion is a small castle ruin in Chlístovice in the Central Bohemian Region of the Czech Republic. It lies near Kutná Hora. It was founded between 1426 and 1427 by Hussite Jan Roháč of Dubá. After a successful four-month siege the castle was conquered and burned by Emperor Sigismund's allies in 1437. Today, only scattered parts of the basement stone walls with some arches and stairs remain of the original 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.