The first document to mention the castle in Carovignot dates back to 1163. Since then, the fortress fell in the hands of several rulers, the Normans of Geoffrey III of Montescaglioso, the Swabians in 1194 and the Angevines in 1306. In 1382 it passed to the prince of Taranto Raimondo del Balzo Orsini who then bequeathed it to his wife, queen Maria of Enghien, countess of Lecce.
The present appearance of the castle is due to recontruction works carried out between 1300's and the 1400's on a previous building. The rare triangular plan features angular towers connected to each other by curtain walls. The whole upper level is slightly jutting, while the walls are thickly crenellated. The curvilinear tower further amplifies the impression of a military building and unveils the Senese influence of the architect Francesco di Giorgio Martini.
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.