Vizmburk Castle was founded by Tas or Peter of Skalice and it was mentioned first time in 1279. This noble house with the stirrup in their coat of arms was known already in the 12th century, when their members held the burgrave office in Kladsko. The Vizmburk estate was a fairly large one with the economic centre in the town of Úpice.
In 1330 the the lords of Dubá owned the estate. Jiří of Dubá supported the Hussites movement which resulted in frequent raids of his estate by Silesian troops. The princes and burghers of Silesia and Lusatia eventually sealed the faith of the Vizmburk castle. Instead of arms they used the power of money. In 1447 the castle was bought up and intentionally demolished.
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.