Written records mention the castle in Danków for the first time in the 15th century. According to the descriptions, it was situated on a flat yard which, due to a steadily rising slope located 1.5 km away from the castle itself, lay 30 m higher than the courtyard. A church was constructed in close proximity to the castle, according to some sources as early as in 1550. The church underwent major alterations in the years 1630-1650 and has survived to this day.
Starting from the 17th century, Danków was the seat of the Warszycki family, and it is believed that the first owner was Andrzej Warszycki, Voivode of Podlaskie Voivodeship. The castle underwent major alterations in 1632, when it was governed by Stanislaus III Warszycki; the bastion fortifications were built then. Following the death of Stanislaus III, the Warszycki family kept the castle for a short time, and at the beginning of the 18th century, the estate was taken over by the Pociej family, and then the Wessel family. Due to the loss of its major strategic and defensive importance, starting from 1823, the structure was falling into ruin; its shape of an elongated quadrangle with two gates remained fairly discernible. Nearly 30 years later, no trace was left of the castle structure — the stone walls were dismantled by the locals. One of the unfavourable changes was the formation of another entrance passage in the structure of the west bastion in the 2nd half of the 20th century. The first works aimed at protecting and preserving the site were carried out in the 1970s. Detailed archaeological and architectural research was conducted within the defensive fortifications. The walls were protected with brick siding on the south, west, and east sides (the last being the waterfront).
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.