The Château de Courcy was mentioned in 1091, when it was owned by Richard de Courcy and besieged by Robert Curthose. At the start of the 17th century, the castle was demolished by order of Richelieu and, losing all military function, slowly became an agricultural enterprise. In 1975, the remaining parts of the former castle including the gate on the road from Tôtes and the gateway to the second enceinte were protected by being added to the supplementary inventory of historical monuments. In spite of this protection, the condition of the site has continued to deteriorate.
The first castle in Courcy was probably built of earth and wood. The structure of the fortification was conceived as a succession of three enceintes (French term used for the inner ring of fortifications), but only the last remains. Surrounded by moats, the last enceinte was about 10 m high and defended by twelve towers, of which only nine round towers remain, and a square tower which probably served as a keep. Elsewhere in the enceinte are the remains of the Saint Catherine chapel. It was built in the 12th century but greatly remodelled in the 15th-16th centuries.
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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.