The earliest sources of Gagi Castle dates from the 11th century. The Armenian historian Vardan (13th century) reported that it was built by King Gagic I (990-1020). The ruins of the castle however date from the older ages and probably Gagik I just rebuilt them.
The castle controlled the route leading to Tbilisi from the south. During the 15th century it also got known as Aghjakala, meaning 'White Castle', due to the color of its walls.
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.