Originally Loosdorf Castle was built as a fortress in medieval times. It was first officially mentioned in 1320, however, based on certain archived documents it was most likely built already in the 10th century. In the course of the Thirty Years' War and due to a massive fire in 1645 parts of the castle were destroyed. Afterwards the castle changed its owners frequently. In 1740 the Liechtenstein Family became the owner of the castle. Between 1760 and 1810 Emmanuel Duke of Liechtenstein executed a lot of construction and decoration works in and around the castle. Based on its long-standing history the castle shows medieval, classicistic and renaissance elements.
1834 Count Friedrich Piatti acquired Loosdorf castle and moved the family residence and their porcelain collection from Dresden to Loosdorf. They were the first Piatti's who partly lived there. Since then the castle is in the possession of the Piatti Family.
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.