St Ibb's Church is located at the top of a hill in the churchyard. The oldest parts date back to the 13th century. It was enlarged in the early 1400s and vaulting was added later in the same century. The tower was damaged in wars between Sweden and Denmark and demolished in 1726. The font dates from the 13th century and is made of Norwegian stone. The altarpiece has been painted by Tobias Gemperlin before 1578 and donated by famous astronomer Tycho Brahe.
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.