Gutenfels Castle was built in 1220. It was used with Pfalzgrafenstein Castle in the middle of the Rhein and the fortified town of Kaub on the far side to provide an impenetrable toll zone for the Holy Roman Emperor until Prussia purchased the area (1866) and ended this toll in 1867.
This castle, primarily owned (since 1257) by the Falkenstein family, is one of the most important examples of the Hohenstaufen military and house construction style at the Rhine. Since 1277 it has been a castle of the Electorate of Palatinate. After an unsuccessful siege in 1504 by landgrave Wilhelm from Hessen, the castle was renamed Gutenfels (solid rock). Rebuilt between 1889 and 1892 it is now used as a hotel.
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.