A great abbey church named Belli Locus dedicated to the Holy Sepulchre was founded in the early 11th century by Fulk Nerra, Count of Anjou, who is buried in the chancel. In 1011 Pope Sergius IV donated some relics of Saints Chrysanthus and Daria and Fulk himself a piece of the Holy Sepulchre he stole from his visit to Jerusalem to the abbey. The pope settled a dispute over the abbey's consecration with the Archbishop of Tours by himself sending a legate to consecrate it. The abbey was closed down in 1791.
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.