The Sparrenburg castle in Bielefeld was erected sometime before 1250 by the counts of Ravensberg. It guarded the Bielefeld Pass over the Teutoburg Forest, as well as acting as the ruling seat of the counts of Ravensberg, and as protection for the city of Bielefeld, probably founded around 1200. Because the construction of a protective castle generally predates the foundation of a town, it is assumed that there was an older castle. In 1256, the castle was first mentioned in records.
Following the discovery of gunpowder and the resultant increasing use of cannon and other firearms, dukes of Cleves (the counts of Ravensberg, the) ordered the expansion of the castle into a fortress of the Early Modern Period that could withstand bombardment from siege guns and also employ its own cannon. Around 1530, a round bastion was added in the west, only accessible from the castle itself via a bridge, from which one could control Bielefeld Pass with artillery. The construction was finished in 1578 and created the largest fortress in Westphalia. The old castle was now surrounded by a terrace and a high defensive wall.
After the War of the Jülich Succession the castle was granted to Dutch confederates. Their occupation became effective in November 1615.
In 1623, in the course of the Thirty Years' War, the Dutch had to retreat before the overpowering advance of the Spanish army. In 1625, Brandenburg's colonel Gent unsuccessfully attempted to reconquer the Sparrenburg with the help of Ravensberg's peasants. In 1636 the Swedes and Hessians besieged the Spanish for nearly one year before they had to hand over the fortress in 1637. In 1642, they left Sparrenburg to their French allies.
In 1648, the Peace of Westphalia confirmed the affiliation to Brandenburg-Prussia. In the following years the Grand Elector Frederick William stayed several times at the fortress, and two of his children were born there.
During the Franco-Dutch War the Sparrenburg successfully resisted its last sieges, in 1673 against troops of Münster and in 1679 French troops.
At the end of the 17th century, the Sparrenburg no longer met the military requirements. Therefore, it was partly used as a prison, and partly subjected to decline. The outer walls were torn down by agreement of King Frederick II of Prussia and were used for the construction of the barracks 55, which still stands at the Hans-Sachs-Straße.
Used as a anti-aircraft emplacement during World War II, the Sparrenburg was heavily damaged in the course of the air raid on Bielefeld on 30 September 1944; only the tower remained undamaged. From 1948 to 1987 there was continuous cleanup and restoration work. From 1955 to 1983 the German Museum of Playing Cards was housed in the rebuilt estate building. A new visitor center was opened in 2014. The above-ground parts of the Sparrenburg can be visited year-round, free of charge. The rest of the castle can be visited daily from April to October.
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.