Ganthem church is a well-preserved Romanesque church, finished in the middle of the 13th century. The choir with its apse is the oldest part, dating from the late 12th century. The nave is slightly later, from the beginning of the 13th century while the tower is the most recent addition. Apart from an enlargement of the windows made in the 19th century, and the addition of a sacristy in the 1930s, the church has remained unchanged since the 13th century.
The interior of the church is decorated with frescos from the 15th century. On the northern wall, a set of paintings depict the Passion of Christ. This set is unusual inasmuch as it has never been painted over, and has retained much of its original vibrancy. On the southern wall, another set of frescos depicts other religious motifs.
The church still contains a number of medieval items. The baptismal font is from the latter half of the 14th century and has been ascribed to the artist Hegvald. The triumphal cross is from circa 1200 and unusually well-preserved. The altarpiece is furthermore a copy of the original, 14th-century altarpiece now belonging to the Swedish History Museum.
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.