Langenau Castle is an old lowland castle in the municipality of Obernhof in the county of Rhein-Lahn-Kreis.
The site of the fortification was the confluence of the Gelbach and the Lahn rivers. As a result, the castle is designed as a lowland type, which is unusual for this region.
In 1243 the castle was first mentioned in the will of Countess Mechthild of Sayn who left it to the Archbishopric of Cologne. The archbishop enfeoffed the fortress shortly thereafter to the noble family of Langenau, cousins of the counts of Laurenburg and thus of the House of Nassau. The family kept the castle as a joint inheritance or Ganerbschaft for centuries.
The original fortress was turned into a water castle on the construction of a dyke. Today, of the 13th century fortification, only the square Romanesque style bergfried is left. The remaining fortifications, an enceinte and an eight-metre-high shield wall with two flanking towers, show elements of Gothic architecture and appeared in the 14th or 15th centuries. Presumably by the middle of the 14th century, when the Langenaus built New Langenau Castle as their main residence, the castle no longer served as a noble seat, but primarily as a base from which to manage the estate.
In 1613 the Langenau family died out. The castle changed ownership several times in the years that followed. In the 17th century, a large timber-framed domestic building was built. In 1696 the mercantile and industrialist family of Marioth purchased the site as their residence and had it converted into a schloss in 1698.
In 1847, Countess Giech, a daughter of Prussian reform minister, vom und zum Stein, became the new occupant. She had the schloss converted in 1851 into a hospital and home for children of the poor.
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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.