The Kehlburg castle was built probably in 933 By the bishop Altwin of Brixen at the hillside over Gais. The most important owners later were the noble family Rost zu Aufhofen, which had the castle in possession for nearly three centuries.
After the fire in 1944 where the castle was nearly completely destroyed, the chapel of the holy Erasmus was rebuild so this was used for many years as a much visited pilgrimage. Unfortunately the castle and the chapel is damaged by vandalism.
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.