St. Nicholas Church (St. Nikolai Kirche) construction was started around 1230, making the building the second oldest church on the island. The size of the church was increased in 1470 and in 1508 the tower of the church was built.
There is a bronze font in the church which dates from 1391. It is not certain how it arrived at the church, but the casting carried an inscription which records that the font was given by Korp Benno the Bishop of Arosia. Another significant item of the 14th century is a polptych which has fourteen panels today but it is believed to have lost further panels. In addition there is another stone font that was rediscovered when nearby buildings were being built. It has since had a base added, and small restorations have also been made.
Amongst the church's artefacts on display is a large chest that was used for storing the parishioners contributions. After each service the collection bag would be emptied into the chest, but it would only be opened once a year. When it was opened then the funds would be distributed to those in need.
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.