The current Bäl church was built during the first half of the 13th century and replaced an earlier stone church on the same site, fragments of which still remain in the wall between the choir and nave. Of the presently visible church, the choir is the oldest part, with the nave and tower being built successively. Paintings were added in the 13th century through 15th centuries. For some reason, the tower was never finished and does not reach its originally intended height.
The church has two portals on the western façade, one leading to the choir and a larger main portal, located on the south side of the nave. The smaller is the older and still Romanesque in style, while the main portal is Gothic, and more profusely decorated. Additionally, there is an entrance on the north façade. The window openings are all original, and have not been enlarged during later centuries.
Inside, the church is decorated by frescos, uncovered in the early 21st century. They depict the Passion of Christ and scenes from the Bible. The church has some medieval items: a triumphal cross (late 13th century), a baptismal font (13th century), and a wooden sculpture depicting Mary. The altarpiece is Baroque, executed in 1664, and the pulpit is from 1744.
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.