Pitsligo Castle originated as a 15th-century keep. There is an arched gateway in the west wall of the outer court, with the date 1656 and the arms of the Forbes and Erskines. In the inner court the date is shown as 1663. At the north-east angle of the courtyard there is a tall flanking drum-tower. The main tower had three vaulted stories, but almost all above the lowest has disappeared. There is a stair tower at the north-east corner which is better preserved. There are panels dated 1577 over the courtyard doorway.
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.