On its site of Quirinus Chapel was originally a heathen shrine which the Romans later worshipped as an early Christian sanctuary. Since the 11th century the site has been consecrated to Saint Quirin and from the beginning of the 13th, services were held in the two caves of the chapel. The Gothic pilgrimage chapel, partly hewn in the rock, was erected in 1355, while the roof and the small belltowers were added afterwards, at the end of the 19th century.
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.