Aspelt Castle is a Baroque residence built in 1590 on the site of a medieval castle. The origins of Aspelt Castle date back to the 11th century when a fortified castle with a moat was built on the site, possibly on Roman ruins. The first written reference to the castle can be found in Theoderich von Wied's Echternach chronicles from 1132. The foundations of the round Gothic towers are probably from the 14th century while the current building was completed in 1590 following transformations carried out by the Ruelle, Kempt and Burthé families. In 1777, the Martinys extended the palace and installed new Baroque windows in the towers. In 1957, the ground floor of the south-west tower was restored.
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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.