Mesagne Castle probably dates back to the 11th century, but the royal fortress we see today was designed and built by renowned military leader Giovanni Antonio Orsini del Balzo in 1430. Since then, alterations have been made but there are traces of its use as a fortress.
The castle consists of two main parts: the oldest one is the quadrangular tower which has three floors, the other includes the rooms on the ground and first floor, connected to the tower through a rectangular room with barrel vaults. In the internal courtyard one can admire the portals with bossage and round arches, which lead to the roof garden.
Today Mesagne castle includes an archaeological museum and events auditorium.
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.