The 11th century wooden stronghold of Racibórz was rebuilt as a brick castle in the third quarter of the 13th century. Around 1290 a chapel was built in the castle with the significant dedication of Saint Thomas of Canterbury.
At present, its most valuable element is the castle chapel, due to its high artistic level called the pearl of Silesian gothic. Fortunately, the reconstructions from the seventeenth and nineteenth centuries did not manage to change its Gothic interior, and the 19th-century matroneum placed on the site of the medieval one, neatly imitates the likely appearance of the original. The gables, western entrance portal and vault in the western bay of the chapel have also been transformed. Next to it is the palace wing. Recently renovated it is a place of cultural and entertainment events and a small 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.