Château de Montreuil-Bonnin has been listed as a historic monument since the very first register of 1840. The castle was built by Richard the Lionheart. Judging by the varied architecture of the different buildings, the castle has clearly undergone many changes throughout its history. The cylindrical towers reflect the evolution of military architecture during the reign of Philip Augustus. The castle was burned down in 1346 by the English forces under the Earl of Derby. From 1361 onward, it remained under English control. In the 16th century, two residential wings were added, and the towers were partially dismantled. During the French Wars of Religion, the castle became a Protestant stronghold. Today, one can still see the ruined towers, the remains of the living quarters, and parts of the original fortifications.
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.