On the site of the current Visconti-Castelbarco Castle, a fortification had been existing at least since the 10th century. At the end of the 13th century the castle became a property of the Visconti of Milan. It was then inherited by a lineage originated by Uberto, brother of Matteo Lord of Milan, initially the Visconti di Somma and later the Visconti di Cislago.
Destroyed in the 17th century, it was raised again in the form of a baroque villa on the original U-shaped plan and with two towers at the corners of the main facade. A crenellated roof was added to the building, providing the current revival castle aspect.
The castle belonged to the Visconti di Cislago until the 18th century. The marriage of the last female member of the Visconti di Cislago to a Castelbarco led the castle in the hands of the bridegroom's family. Their descendants assumed the surname of Castelbarco-Visconti.
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.