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 Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.