Liebenstein Castle was probably built in the 13th century as well as near Sterrenberg castle. Both were owned by feodal lords of Bolanden (later Sponheim-Dannenfels). The gate tower was added 1363 and tower in 1380 and the castle was enlarged in the 15th century. However, already in 1529 it was abandoned and left to decay. The major restoration took place in 1977 and today Liebenstein is a hotel and restaurant.
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.