Saint Nicolas and Saint Wenceslas Church in Cieszyn is a Romanesque rotunda to serve the role of a castle chapel and a stronghold church.
The rotunda was erected within the walls of the castellan stronghold at the top of Castle Mount (built in the 10th century and the first half of the 11th century). The first reference to the rotunda comes from 1223, where it was described as St. Nicolas Chapel, obliged to pay a tithe to Norbertine’s sisters in Rybnik. The end of the 13th century and the entire 14th century was related to a reconstruction of the castle and replacement of wood by bricks. The Romanesque rotunda was adapted to the Gothic castle: the level of the floor was raised by two meters, Romanesque windows in the apse were walled up and bigger, Gothic ones were created.
At the time of the conversion of the lower castle in 1838-40, the Romanesque walls of the temple were ringed by a brick wall. New and bigger windows were walled out and a new, tin helmet was put up. The level of the interior nave and the exterior area was raised (the building was almost halfway up rimmed by soil). The Romanesque chapel received a classical division of the façade adjusted to the style of the castle. The design of a romantic pavilion was created by Joseph Koernhausel. The interior of the Rotunda was decorated by a neo-gothic wooden altar and a picture of Saint Wenceslas.
The Rotunda of Cieszyn as one of the oldest monuments of Polish architecture is depicted on the current Polish 20 PLN banknote.
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.