Lahneck Castle was built in 1226 by the Archbishop of Mainz Siegfried III of Eppstein to protect his territory at the mouth of the Lahn, where the town of Oberlahnstein and a silver mine had come into the possession of the Archbishopric in 1220. The castle chapel, dedicated to Saint Ulrich of Augsburg, was built in 1245, in the same year the first Burggraf took up residence in the castle.
In 1298, King Adolf of Nassau was a guest at the castle, shortly before his death in the Battle of Göllheim against King Albert I of Habsburg. In order to avenge him, the Burggraf of Lahneck, Friedrich Schilling of Lahnstein, participated in a conspiracy against Albert. The castle was stormed in 1309 and Friedrich Schilling was executed.
According to legend, when the Knights Templar were ordered by Pope Clement V to disband in 1312, the last 12 Templars took refuge in the castle, where they perished in a heroic fight to the death with forces of Mainz Archbishop Peter of Aspelt. In 1332, Pope John XXII granted a 40-day indulgence to those attending services in the castle chapel.
In 1475, Mainz Archbishop Theodoric of Isenburg-Büdingen had the castle strengthened with two outer walls following the Mainz Bishops Feud with his rival archbishop, Adolph II of Nassau. In 1633, during the Thirty Years War, the castle was heavily damaged by Swedish and Imperial troops.
On July 18, 1774, Johann Wolfgang von Goethe wrote the poem Geistesgruß. It was inspired by the sight of Lahneck Castle during his travels along the Lahn River.
In the German Mediatisation of 1803, in which the Archbishopric of Mainz lost its secular territories, Lahneck Castle was granted to the Duchy of Nassau. In 1850 it was sold and has remained in private ownership since. Edward Moriarty, a Director of the Rhenish Railway Company, became one of its first owners. During the ownership of Earl Kleist-Tychow a more than life-sized portrait of Queen Victoria was presented which can still be seen at the castle. Imperial Admiral Robert Mischke, later commander of armoured cruiser 'von der Tann', purchased the castle in 1909 and it has been owned by his family ever since.
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.