Château de Tancarville was built in the 11th century by Raoul, the chamberlain of Dukes of Normandy. In the 12th century the square tower was built with 1.65m thick walls. In 1418 at the time of the conquest of Normandy by Henry V of England, the title of Earl of Tancarville was given to John Grey. After the Hundred Years War the Harcourt family restored the castle. The ballroom was built in 1468. In 1709 the castle was partially rebuilt by the Count of Evreux. After 1789, the castle was plundered and partly burned. In the 1960s , the castle served as a summer camp for children.
References:I am a direct descendant of Raoul
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.