Château du Guildo dates from the 11th century, when there was a fortified manor, probably made of wood. The stone castle was built in the 13th century in three phases. It was destroyed a century later and the new castle construction began in the late 1300s. Later it was restored as a living residence, but badly damaged in the late 1400s during the French-Breton War. The castle took part also to the Wars of Religion, when it was surrounded several times by Catholic League. This caused the final destruction Château du Guildo.
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.