Alunda Church originates from the 1200s and it was enlarged in 1400s. It was badly damaged by fire in 1542 and 1715. The ruins were left to decay until the reconstruction made in 1780-1787. The font is the main item of inventory retained from medieval times. There are also the remains of medieval frescoes made in 1465. The altarpiece is from 1862 painted by Johan Zacharius Blackstadius.
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.