Santa Clara Monastery was founded by Don Sancho Sanchez de Velasco and his wife Doña Sancha García in 1313. Throughout the centuries almost all members of the Velasco family were buried there.
The Gothic church has a single nave and is divided into side chapels. The High Altar has three altarpieces bathed in gold in the Rococo style.
The museum shows the works of art and relics of the monastery, most donated by the family Fernandez de Velasco.
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.