The Church of Most Holy Saviour (Santissimo Salvatore) was built starting in 1682 in the area of an ancient female Basilian monastery founded by Robert Guiscard in 1072. The building was designed by the architect Paolo Amato, but also Giacomo Amato and Angelo Italia were involved in the construction.
It was said that Constance, Queen of Sicily (1154-1198) had been confined to the church as a nun since childhood due to the prediction that 'her marriage would destroy Sicily' before 30 when she was eventually engaged for political reason.
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.