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Greifenstein castle was first mentioned in 1158. The castle was largely destroyed in the second half of the 13th century during the wars between Count Meinhard II of Tyrol-Gorizia and the Bishop of Trent. The reconstructed castle became property of the lords of Starkenberg after the last member of the family of Greifenstein was killed in the Battle of Sempach in 1386.
Greifenstein was besieged for weeks by Duke Frederick IV of Austria-Tyrol first in 1418 and again in 1423. During the second time castle was conquered in 1426. After the Habsburg family took the possession. Today Greifenstein lies in ruins.
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.