Katharinenkirche (St. Catherine's Church) was an important mediaeval church, destroyed during the Second World War and preserved as a ruin.
St. Catherine's was the church of a former Dominican convent, in the Diocese of Bamberg, famous for its Medieval Library. It was founded in 1295 by Konrad von Neumarkt and his wife Adelheid, patricians of the Pfinzig family. In the Middle Ages it had an important medieval library. After the Reformation, it became a Lutheran church. The convent was closed in 1596 after the last inhabitant died.
The church was associated with the Meistersingers who met there from 1620 to 1778, and is featured in the opening scene of Richard Wagner's opera Die Meistersinger von Nürnberg.
Although destroyed by air raids in 1945, it was partially restored (1970–71) and is used for events such as open-air concerts.
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.