The cathedral church of St. James the Elder is situated within the old quarter next to the city walls and in the past it could fulfil a defensive function. It was built in stages from 1380 until 1445 and finally completed in its present shape during the early 17th c. The building was erected on the rectangular plan of ceramic bricks, with nave and two aisles, hall type, without separate presbytery. Late Gothic vaulting is late 16th c. During the same time (1562-1596) the tower was added. Piotr Olszewski designed chapels flanking the tower in 1721.
The interior décor is mainly new gothic. The older elements are: in the left aisle a late Gothic triptych from early 16th c., in the right aisle the painted triptych – “Crucifixion” of 1553 in new-gothic framing. The main altar and pulpits in new-gothic style. In the baptistery chapel a Baroque 18th c. painting of the Virgin of the Rosary surrounded by St, Catherine of Siena and St. Dominique. Initially the church was a parish church of St. James the Elder, patron of the town later raised to the distinction of a joint cathedral.
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.