The Counts of Schwalenberg left the old castle Schwalenberg, which originally gave the family its name, later Oldenburg near Marienmünster, and built the city and the new castle, now known as Burg Schwalenberg. The castle was constructed from 1228 to 1231 during the time of Count Volkwin III. Around the same time, the town of Schwalenberg also emerged. The castle was pledged to various noble families from 1358 until the first quarter of the 17th century. In 1613, after the death of his father Simon VI., Hermann (1590–1620) inherited the office and the castle of Schwalenberg. He decreed that the keep be demolished in 1618. Later, it became the seat of branches of the House of Lippe. In 1627/28, a castle with elements of the late Renaissance was built on the site of the castle. One wing of the castle still remains, which was renovated between 1911 and 1913. Between 1938 and 1945, the castle was used as a convalescent home for mothers, and after that, it served as an evangelical children's recreation home until 1962. Subsequently, the building was renovated and converted into a hotel.
Situated on a hill above the town, the castle is accessible on foot or by vehicle from the city. The castle was sold in 2017, and as part of the planned redevelopment, it is undergoing renovations until 2019. The castle will be transformed into holiday apartments. These were approved in December 2018, and work on them has commenced. The castle cafe reopened in mid-January 2019.
References: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.