In 1494 Louis Picart, magistrate of Troyes and Tournaisis, friend and chamberlain of King Louis XII with whom he went to Italy, undertook the construction of the Château d'Ételan. It was built on the site of a fortress which has been destroyed under the order of Louis XI. Of the medieval construction, only the cellar, the castle wall and the guard house dating from 1350 remain.
The castle was later converted to a 15th-century flamboyant gothic mansion. The building consists of two dwellings built from layers of bricks and stones and joined together by a magnificent stone staircase dating from the first Renaissance. As integral part of the main building, the Chapel, dedicated to Mary Magdalene, include stained glass windows, wall paintings and statues which characterised the first Norman Renaissance.
History or legend tells us that several kings and famous people have spent time at Ételan like Louis XI, Frans I, Catherine de' Medici, Charles IX with the future kings Henry III and Henry IV and later Voltaire (1723–1724).
References: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.