Château de Castelnoubel is situated on a promontory overlooking the Mondot valley near Bon-Encontre. The site where the castle stands has been occupied since the 10th or 11th century. Construction of the current castle began in the late 13th century. It belonged to the Marmande family initially, with Arnaud de Marmande being the first known lord. The Durfort family took ownership after the Marmandes, with Arnaud de Durfort receiving jurisdiction rights from Charles le Mauvais, King of Navarre. The Durforts continued to hold Castelnoubel until the late 16th century, when it passed through marriage to the Secondat family.
In the early 18th century, Castelnoubel came into the possession of Louis Pascault de Poléon and remained in the Pascault de Poléon family until the 19th century.Pierre Loubat and later Joseph-Marie-Étienne Giraud, who served as secretary general of the prefecture of Agen, were subsequent owners.The castle eventually became a historic monument in 1966.
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.