Hexenagger castle probably was first built in the tenth century, as it is first mentioned in a record from the Monastery of St. Emmeram of Regensburg in 982. Originally, the Bavarian noble family of Muggenthaler resided in the castle. The castle was destroyed during the Thirty Years' War and rebuilt in the Baroque style. Since the extinction of the Hexenagger Muggerthaler family line, the castle has passed through several owners. One of the most notable owners was Elector Karl Albrecht, later Holy Roman Emperor Charles VII, who purchased the castle in 1724 as a gift for his mistress, Countess Maria Josepha von Morawitzky.
Today, the castle is privately owned by Eberhard Leichtfuß and his family. Mr. Leichtfuß is the sixth generation of the noble family von Weidenbach to inherit and live in the castle. The family supports the restoration of the castle by hosting events including summer medieval festivals, weddings, company events, and Christmas markets.
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.