The Ramsberg Castle was built around 1200-1225 probably by the knight Ulrich von Plochingen and Konrad, the monk from Rechenberg. In 1327-1529 the castle was owned by the lords of Rechenberg. The Gothic chapel was built in 1560. It was initially dedicated to St. Margaret and later to St. Martin. Between 1560 and 1580 the castle was rebuilt a second time.
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.