The Holy Cross Church was built between 1734 and 1739 (the towers were built in between 1854 and 1856) in the location of the destroyed in 1545 monastery of the Dominicans - for the need of Jesuits which arrived to the town in 1677 (architect J. Frisch). The church has a single-aisle, with a number of side chapels and the tribunes. The ceiling stands out due to J.Kubena frescoes (1739-1745) presenting the glory of the Holy Cross, the missions of the Jesuit Order and figures of saints.
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.