As part of the Grand Duchy of Moscow, Zaraysk was one of the fortresses forming a part of the Great Abatis Border, a fortified line of felled trees, barricades, fortresses, ditches, which were built by Russians as a protection against the hordes of the Crimean and Kazan Tatars. In 1531, a stone kremlin was built in place of the former wooden citadel. The Tatars failed to take the fortress during their raids in 1533, 1541, and 1570. It was briefly captured by the Lisowczycy during the Time of Troubles.
The brick-and-limestone kremlin in Zaraysk still stands and is kept in a rather good condition. The citadel is very small and has a rectangular shape, with only six towers, two of which are pierced by the gates.
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.