Taggenbrunn Castle site was already used as a Celtic-Roman hillfort settlement in the 6th century BC. The first mention of current castle dates from 1142. The castle was destroyed in 1258 in a rebellion agains Duke Albrecht I and rebuilt ten years later. Later the castle was owned by the Holy Roman Empire and archbishopric of Salzburg. The castle was expanded in 1497-1503. In the 17th and 18th centuries Taggenbrunn was left to decay. Today there is a wineyard and restaurant.
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.