Salacgrīva was a medieval castle built in 1226 by the bishopric of Riga. The three-tower castle served as an outpost to control access to the port of Salaca. It was captured in 1391, burned in 1564 and again drastically damaged in 1575 by Russian and Tartar warriors who fought side by side with the troops of Duke Magnus of Holstein.
In 1581, Salacgrīva castle was attacked by the Swedish troops of Commander Thomas von Enden, and during the Second Northern War it was almost destroyed. Between 1704 and 1704, it was finally demolished, and since then there have been no restoration works carried out there.
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.