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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Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.